In its 2021 Interim National Security Strategic Guidance, the Biden Administration made clear that it sees China as a major and growing threat: “China…has rapidly become more assertive” and “is the only competitor potentially capable of combining its economic, diplomatic, military, and technological power to mount a sustained challenge to a stable and open international system.1
While this is labeled an interim guidance, it probably will be reflected eventually in the Administration’s full National Security Strategy when it is issued.
Threats to the Homeland
Both China and Russia are seen as revisionist powers, but they pose very different challenges to the United States. The People’s Republic of China (PRC) has the world’s second-largest gross domestic product (GDP), and its economy as measured in terms of purchasing power parity (PPP) is far larger than the U.S. economy.2 China is also an integral and important part of the global supply chain for crucial technologies, especially those relating to information and communications technology. As a result, it has the resources to support a comprehensive military modernization program that has been ongoing for more than two decades and spans the conventional, space, and cyber realms as well as weapons of mass destruction, an area that includes a multipronged nuclear modernization effort.
At the same time, the PRC has been acting more assertively—even aggressively—against a growing number of its neighbors. Unresolved land and maritime disputes have led Beijing to adopt an increasingly confrontational attitude toward territorial disputes in the South China Sea, in the East China Sea, and along the China–India border, and Beijing’s reaction to the Democratic Progressive Party’s victories in Taiwan’s 2016 and 2020 elections has heightened cross-Strait tensions.
In May 2020, the U.S.–China Economic and Security Review Commission reported that, “[w]ith the world distracted by COVID-19, China also intensified its multi-faceted pressure campaign against Taiwan. Chinese military aircraft crossed the median line of the Taiwan Strait three times in the early months of 2020 after only one such incursion in 2019.” The commission further noted that China conducted several provocative military exercises around the island and “continued its efforts to poach Taiwan’s remaining diplomatic allies as the virus spread.”3 Since then, China has been intruding regularly across the median line of the Taiwan Strait with ever-larger groups of aircraft.
Meanwhile, China’s attempts to obscure the origins of the COVID-19 pandemic and stifle international investigations into the matter have undermined global health efforts. Beijing has also sought to exclude Taiwan from multilateral efforts to combat the pandemic.
Growing Conventional Capabilities. The Chinese People’s Liberation Army (PLA) remains one of the world’s largest militaries, but its days of largely obsolescent equipment are in the past. Nearly two decades of officially acknowledged double-digit growth in the Chinese defense budget have resulted in a comprehensive modernization program that has benefited every part of the PLA. This has been complemented by improvements in Chinese military training and, in 2015, the largest reorganization in the PLA’s history.4 The PLA has lost 300,000 personnel since those reforms, but its overall capabilities have increased as newer, much more sophisticated systems have replaced older platforms.
A major part of the 2015 reorganization was the establishment of a separate ground forces headquarters and bureaucracy; previously, the ground forces had been the default service providing staffs and commanders. Now the PLA Army (PLAA), responsible for the PLA’s ground forces, is no longer automatically in charge of war zones or higher headquarters functions. At the same time, the PLAA has steadily modernized its capabilities, incorporating both new equipment and a new organization. It has shifted from a division-based structure toward a brigade-based one and has been improving its mobility, including heliborne infantry and fire support.5 These forces are increasingly equipped with modern armored fighting vehicles, air defenses, both tube and rocket artillery, and electronic support equipment.
The PLA Navy (PLAN) is Asia’s largest navy “and within the past few years…has surpassed the U.S. Navy in numbers of battle force ships (meaning the types of ships that count toward the quoted size of the U.S. Navy).”6 According to the U.S. Department of Defense (DOD):
The PLAN is the largest navy in the world with a battle force of approximately 355 platforms, including major surface combatants, submarines, aircraft carriers, ocean-going amphibious ships, mine warfare ships, and fleet auxiliaries. This figure does not include 85 patrol combatants and craft that carry anti-ship cruise missiles (ASCMs). The PLAN’s overall battle force is expected to grow to 420 ships by 2025 and 460 ships by 2030.7
Although the total number of ships has dropped, the PLAN has fielded increasingly sophisticated and capable multi-role ships. Multiple classes of surface combatants are now in series production, including the Type 055 cruiser and the Type 052C and Type 052D guided missile destroyers, each of which fields long-range surface-to-air missile (SAM) and anti-ship cruise missile systems, as well as the Type 054 frigate and Type 056 corvette.
The PLAN has similarly been modernizing its submarine force. Since 2000, the PLAN has consistently fielded between 50 and 60 diesel-electric submarines, but the age and capability of the force have been improving as older boats, especially 1950s-vintage Romeo-class boats, are replaced with newer designs. These include a dozen Kilo-class submarines purchased from Russia and domestically designed and manufactured Song and Yuan classes. All of these are believed to be capable of firing both torpedoes and anti-ship cruise missiles.8 The Chinese have also developed variants of the Yuan, with an air-independent propulsion (AIP) system that reduces the boats’ vulnerability by removing the need to use noisy diesel engines to recharge batteries, and are “expected to produce a total of 25 or more Yuan class submarines by 2025.”9
The PLAN has been expanding its amphibious assault capabilities as well. The PLA Marine Corps, for example, is China’s counterpart to the U.S. Marine Corps. According to the DOD:
The PLANMC previously consisted of two brigades (approximately 10,000 personnel) and was limited in geography and mission to amphibious assault and defense of South China Sea outposts. In 2020, the PLANMC continued to mature an enlarged force structure of eight brigades intended to be scalable and mobile, modernize its capabilities for joint expeditionary operations—including operations beyond the First Island Chain—and become more proficient in conventional and irregular warfare. Throughout 2020, the PLANMC continued to work towards fully equipping and training its four newly established maneuver brigades (in addition to its two previously existing brigades), a SOF brigade, and an aviation (helicopter) brigade.10
To move this force, the Chinese have begun to build more amphibious assault ships, including Type 071 amphibious transport docks.11 Each can carry about 800 naval infantrymen and move them to shore by means of four air-cushion landing craft and four helicopters.
Supporting these expanded naval combat forces is a growing fleet of support and logistics vessels. The 2010 PRC defense white paper noted the accelerated construction of “large support vessels.” It also noted specifically that the navy is exploring “new methods of logistics support for sustaining long-time maritime missions.”12 These include tankers and fast combat support ships that extend the range of Chinese surface groups and allow them to operate for more prolonged periods away from main ports. Chinese naval task forces dispatched to the Gulf of Aden have typically included such vessels.
The PLAN has also been expanding its naval aviation capabilities, the most publicized element of which has been the growing Chinese carrier fleet. This currently includes not only the Liaoning, purchased from Ukraine over a decade ago, but a domestically produced copy, the Shandong, that completed its first exercise in 2021.13 Both of these ships have ski jumps for their air wing, but the Chinese are also building several conventional takeoff/barrier landing (CATOBAR) carriers (like American or French aircraft carriers) that will employ catapults and therefore allow their air complement to carry more ordnance and/or fuel.14
The PLAN’s land-based element is modernizing as well, with a variety of long-range strike aircraft, anti-ship cruise missiles, and unmanned aerial vehicles (UAVs) entering the inventory. In addition to more modern versions of the H-6 twin-engine bomber (a version of the Soviet/Russian Tu-16 Badger), the PLAN’s Naval Aviation force has added a range of other strike aircraft to its inventory. These include the JH-7/FBC-1 Flying Leopard, which can carry between two and four YJ-82 anti-ship cruise missiles, and the Su-30 strike fighter.
The PLA Air Force (PLAAF), with more than 1,700 combat aircraft, is Asia’s largest air force. It has shifted steadily from a force focused on homeland air defense to one that is capable of power projection, including long-range precision strikes against both land and maritime targets. The DOD’s 2021 report on Chinese capabilities notes that:
Although they currently have limited power projection capability, both the PLAAF and PLAN Aviation are seeking to extend their reach. The PLAAF, in particular, has received repeated calls from its leadership to become a truly “strategic” air force, able to project power at long distances and support Chinese national interests wherever they extend.15
The PLAAF currently has more than 700 fourth-generation fighters that are comparable to the U.S. F-15, F-16, and F-18. They include the domestically designed and produced J-10 as well as the Su-27/Su-30/J-11 system, which is comparable to the F-15 or F-18 and dominates both the fighter and strike missions.16 China is also believed to be preparing to field two stealthy fifth-generation fighter designs. The J-20 is the larger aircraft and resembles the American F-22 fighter. The J-31 appears to resemble the F-35 but with two engines rather than one. The production of advanced combat aircraft engines remains one of the greatest challenges to Chinese fighter design.
The PLAAF is also deploying increasing numbers of H-6 bombers, which can undertake longer-range strike operations including operations employing land-attack cruise missiles. Although the H-6, like the American B-52 and Russian Tu-95, is a 1950s-era design copied from the Soviet-era Tu-16 Badger bomber, the latest versions (H-6K) are equipped with updated electronics and engines and are made of carbon composites. In addition, China is developing the H-20, a flying wing–type stealth bomber that is probably similar to the U.S. B-2.17
Equally important, the PLAAF has been introducing a variety of support aircraft, including airborne early warning (AEW), command and control (C2), and electronic warfare (EW) aircraft. These systems field state-of-the-art radars and electronic surveillance systems that allow Chinese air commanders to detect potential targets, including low-flying aircraft and cruise missiles, more quickly and gather additional intelligence on adversary radars and electronic emissions. China’s combat aircraft are also increasingly capable of undertaking mid-air refueling, which allows them to conduct extended, sustained operations, and the Chinese aerial tanker fleet, which is based on the H-6 aircraft, has been expanding.
At the biennial Zhuhai Air Show, Chinese companies have displayed a variety of unmanned aerial vehicles that reflect substantial investments and research and development efforts. The surveillance and armed UAV systems include the Xianglong (Soaring Dragon) and Sky Saber systems. The DOD’s 2019 report on Chinese capabilities stated that China had “successfully tested the AT-200, which it claims is the ‘world’s first large cargo UAV,’” and further specified that “[t]his drone can carry up to 1.5 tons of cargo and… may be especially suited to provide logistic support to PLA forces in the South China Sea.”18 Chinese UAVs have been included in various military parades over the past several years, suggesting that they are being incorporated into Chinese forces, and the DOD’s 2021 report on Chinese capabilities states that “The PLAAF continues to modernize with the delivery of domestically built aircraft and a wide range of UAVs.”19
The PLAAF is also responsible for the Chinese homeland’s strategic air defenses. Its array of surface-to-air missile batteries is one of the world’s largest and includes the Russian S-300 (SA-10B/SA-20) and its Chinese counterpart, the Hongqi-9 long-range SAM. The S-400 series of Russian long-range SAMs, delivery of which began in 2018, mark a substantial improvement in PLAAF air defense capabilities, as the S-400 has both anti-aircraft and anti-missile capabilities.20 China has deployed these SAM systems in a dense, overlapping belt along its coast, protecting the nation’s economic center of gravity. Key industrial and military centers such as Beijing are also heavily defended by SAM systems.
China’s airborne forces are part of the PLAAF. The 15th Airborne Corps has been reorganized from three airborne divisions to six airborne brigades in addition to a special operations brigade, an aviation brigade, and a support brigade. These forces have been incorporating indigenously developed airborne mechanized combat vehicles for the past decade, giving them more mobility and a better ability to engage armored forces.
Nuclear Capability. Chinese nuclear forces are the responsibility of the PLA Rocket Forces (PLARF), one of the three new services created on December 31, 2015. China’s nuclear ballistic missile forces include land-based missiles with a range of 13,000 kilometers that can reach the U.S. and CSS-4 and submarine-based missiles that can reach the U.S. when the submarine is deployed within missile range.
The PRC became a nuclear power in 1964 when it exploded its first atomic bomb as part of its “two bombs, one satellite” effort. China then exploded its first thermonuclear bomb in 1967 and orbited its first satellite in 1970, demonstrating the capability to build a delivery system that can reach the ends of the Earth. China chose to rely primarily on a land-based nuclear deterrent instead of developing two or three different basing systems as the United States did.
Unlike the United States or the Soviet Union, China chose to pursue only a minimal nuclear deterrent. The PRC fielded only a small number of nuclear weapons: 100–150 weapons on medium-range ballistic missiles and approximately 60 intercontinental ballistic missiles (ICBMs). Its only ballistic missile submarine (SSBN) conducted relatively few deterrence patrols (perhaps none),21 and its first-generation submarine-launched ballistic missile (SLBM), the JL-1, if it ever attained full operational capability had limited reach. The JL-1’s 1,700-kilometer range makes it comparable to the first-generation Polaris A1 missile fielded by the U.S. in the 1960s.
After remaining stable for several decades, China’s nuclear force became part of Beijing’s two-decade modernization effort. The result has been both modernization and expansion of the Chinese nuclear deterrent. The core of China’s ICBM force is the DF-31 series, a solid-fueled, road-mobile system, along with a growing number of longer-range, road-mobile DF-41 missiles that may already be in the PLA operational inventory. The DOD’s 2019 report on Chinese capabilities characterized the DF-41 as “a new MIRV-capable, road-mobile ICBM,”22 and its 2021 report (as have previous reports) again states that “China appears to be considering additional DF-41 launch options, including rail-mobile and silo basing.”23 China’s medium-range nuclear forces have similarly shifted to mobile, solid-rocket systems so that they are both more survivable and more easily maintained.
This past year has seen a sudden inflation in the number of strategic nuclear warheads available to the PLA Rocket Force. Imagery analysts at several think tanks discovered at least three fields of silos under construction in western China.24 Each appears to contain around 100 silos, indicating that China could expand its land-based nuclear deterrent component by more than an order of magnitude.
Notably, the Chinese are also expanding their ballistic missile submarine fleet. Replacing the one Type 092 Xia-class SSBN are six Type 094 Jin-class SSBNs, all of which are operational. Equipped with the longer-range JL-2 SLBM, “the PLAN’s six operational Jin class SSBNs represent the PRC’s first credible sea-based nuclear deterrent.” In addition, “[e]ach Jin class SSBN can carry up to 12 JL-2 SLBMs.”25
There is some possibility that the Chinese nuclear arsenal now contains land-attack cruise missiles. The CJ-20, a long-range, air-launched cruise missile carried on China’s H-6 bomber, may be nuclear-tipped, although there is not much evidence that China has pursued such a capability. China is also believed to be working on a cruise missile submarine that, if equipped with nuclear cruise missiles, would further expand the range of its nuclear attack options.26
As a result of its modernization efforts, China’s nuclear forces appear to be shifting from a minimal deterrent posture, suited only to responding to an attack and then with only limited numbers, to a more robust but still limited deterrent posture. While the PRC will still likely field fewer nuclear weapons than either the United States or Russia, it will field a more modern and diverse set of capabilities than India, Pakistan, or North Korea, its nuclear-armed neighbors, are capable of fielding. If there are corresponding changes in doctrine, modernization will enable China to engage in limited nuclear options in the event of a conflict.
This assessment changes, however, if the missiles going into the newly discovered silos are equipped with MIRVs (multiple independently targetable reentry vehicles). With five MIRVs atop each missile, for example, 300 new ICBMs would have some 1,500 warheads—equivalent to the U.S. and Russian numbers allowed under New START. Even with fewer than 300 ICBMs, the new SLBMs and new bombers would enable China, within a few years, to field as large a nuclear force as the United States or Russia is capable of fielding.
In addition to strategic nuclear forces, the PLARF has responsibility for medium-range and intermediate-range ballistic missile (MRBM and IRBM) forces. These include (among others) the DF-21 MRBM, which has a range of approximately 1,500 kilometers, and the DF-26 IRBM, which has a range of approximately 3,000 kilometers and “is capable of conducting precision conventional or nuclear strikes against ground targets, such as U.S. military bases on Guam, as well as against maritime targets.”27 It is believed that Chinese missile brigades equipped with these systems may have both nuclear and conventional responsibilities, making any deployment from garrison much more ambiguous from a stability perspective. The expansion of these forces also raises questions about the total number of Chinese nuclear warheads.
While it is unclear whether they are nuclear-armed, China’s hypersonic glide vehicles also pose a growing threat to the United States and its allies. Hypersonic glide vehicles are slower than ICBMs—Mach 5 for a hypersonic vehicle as opposed to Mach 25 for an ICBM warhead—but are designed to maneuver during their descent, making interception far more difficult. During a Chinese test in August 2021, a hypersonic vehicle apparently went into orbit.28 This creates a fundamentally different threat, as a fractional orbital bombardment system (FOBS) could allow attacks from southern trajectories (that is, from over the South Pole) or even the placement of warheads in orbit, which would make them almost impossible to intercept. Even without a nuclear warhead, an orbiting hypersonic vehicle could do enormous damage to a city or a military facility such as an air base or an ICBM silo. Notably, because of the strategic instability that FOBS programs would introduce, neither the U.S. nor the Soviet Union ever pursued them.
Cyber and Space Capabilities. The PLA’s major 2015 reorganization included creation of the PLA Strategic Support Force (PLASSF), which brings the Chinese military’s electronic, network (including cyber), and space warfare forces under a single service umbrella. Previously, these capabilities had been embedded in different departments across the PLA’s General Staff Department and General Armaments Department. By consolidating them into a single service, the PLA has created a Chinese “information warfare” force that is responsible for offensive and defensive operations in the electromagnetic and space domains.
Chinese network warfare forces are known to have conducted a variety of cyber and network reconnaissance operations as well as cyber economic espionage. In 2014, the U.S. Department of Justice charged PLA officers from Unit 61398, then of the General Staff Department’s 3rd Department, with the theft of intellectual property and implanting of malware in various commercial firms.29 Members of that unit are thought also to be part of Advanced Persistent Threat-1, a group of computer hackers believed to be operating on behalf of a nation-state rather than a criminal group. In 2020, the Department of Justice charged several PLA officers with one of the largest breaches in history: stealing the credit ratings and records of 147 million people from Equifax.30
The PRC has been conducting space operations since 1970 when it first orbited a satellite, but its space capabilities didn’t gain public prominence until 2007 when the PLA conducted an anti-satellite (ASAT) test in low-Earth orbit against a defunct Chinese weather satellite. The test became one of the worst debris-generating incidents of the space age: Many of the several thousand pieces of debris that were generated will remain in orbit for more than a century.
Equally important, Chinese counter-space efforts have been expanding steadily. The PLA not only has tested ASATs against low-Earth orbit systems, but also is believed to have tested a system designed to attack targets at geosynchronous orbit (GEO) approximately 22,000 miles above the Earth. As many vital satellites are at GEO, including communications and missile early-warning systems, China’s ability to target such systems constitutes a major threat. In early 2022, China’s Shijian-22 towed a dead Chinese satellite into a “graveyard” orbit above the GEO belt.31 While this was officially touted as a servicing operation, the ability to attach one satellite to another and then tow it also has potential military implications.
The creation of the PLASSF, incorporating counter-space forces, reflects the movement of counter-space systems, including direct-ascent ASATs, out of the testing phase to fielding with units. In 2018, for example, the U.S. National Air and Space Intelligence Center (NASIC) noted that “China has military units that have begun training with anti-satellite missiles.”32
Threats to the Commons
The U.S. has critical sea, air, space, and cyber interests at stake in the East Asia and South Asia international common spaces. These interests include an economic interest in the free flow of commerce and the military use of the commons to safeguard America’s own security and contribute to the security of its allies and partners.
Washington has long provided the security backbone in these areas, and this in turn has supported the region’s remarkable economic development. However, China is taking increasingly assertive steps—including the construction of islands atop previously submerged features—to secure its own interests, and two things seem obvious: China and the United States do not share a common conception of international space, and China is actively seeking to undermine American predominance in securing international common spaces.
In addition, as China expands its naval capabilities, it will be present farther and farther away from its home shores. As part of this effort, it established its first formal overseas military base in 2017 pursuant to an agreement with the government of Djibouti.
Dangerous Behavior in the Maritime and Airspace Common Spaces. The aggressiveness of the Chinese navy, maritime law enforcement forces, and air forces in and over the waters of the East China Sea and South China Sea, coupled with ambiguous, extralegal territorial claims and assertion of control there, poses an incipient threat to American and overlapping allied interests. Chinese military writings emphasize the importance of establishing dominance of the air and maritime domains in any future conflict.
Although the Chinese do not necessarily have sufficient capacity to prevent the U.S. from operating in local waters and airspace, the ability of the U.S. to take control at acceptable costs in the early stages of a conflict has become a matter of greater debate.33 A significant factor in this calculus is the fact that China has “fully militarized at least three of several islands it built in the disputed South China Sea, arming them with anti-ship and anti-aircraft missile systems, laser and jamming equipment and fighter jets in an increasingly aggressive move that threatens all nations operating nearby.”34 China also has been intensifying its challenges to long-standing rivals Vietnam and the Philippines and has begun to push toward Indonesia’s Natuna Islands and into waters claimed by Malaysia.
It is unclear whether China is yet in a position to enforce an air defense identification zone (ADIZ) consistently, but the steady two-decade improvement of the PLAAF and PLAN naval aviation will eventually provide the necessary capabilities. Chinese observations of recent conflicts, including wars in the Persian Gulf, the Balkans, and Afghanistan, have emphasized the growing role of airpower and missiles in conducting “non-contact, non-linear, non-symmetrical” warfare.35 This growing parity, if not superiority, constitutes a radical shift from the Cold War era when the U.S. and its allies clearly would have dominated air and naval operations in the Pacific.
China has also begun to employ nontraditional methods of challenging foreign military operations in what Beijing regards as its territorial waters and airspace. It has employed lasers, for example, against foreign air and naval platforms, endangering pilots and sailors by threatening to blind them.36
Increased Military Space Activity. One of the key force multipliers for the United States is its extensive array of space-based assets. Through its various satellite constellations, the U.S. military can track opponents, coordinate friendly forces, engage in precision strikes against enemy forces, and conduct battle-damage assessments so that its munitions are expended efficiently.
Because the American military is expeditionary—meaning that its wars are fought far from the homeland—its reliance on space-based systems is greater than that of many other militaries. Consequently, it requires global rather than regional reconnaissance, communications and data transmission, and meteorological information and support. At this point, only space-based systems can provide this sort of information on a real-time basis. No other country is capable of leveraging space as the U.S. does, and that is a major advantage. However, this heavy reliance on space systems is also a key American vulnerability.
China fields an array of space capabilities, including its own BeiDou/Compass system of navigation and timing satellites, and has claimed a capacity to refuel satellites.37 It has four satellite launch centers. China’s interest in space dominance includes not only accessing space, but also denying opponents the ability to do the same. As one Chinese assessment notes, space capabilities provided 70 percent of battlefield communications, more than 80 percent of battlefield reconnaissance and surveillance, and 100 percent of meteorological information for American operations in Kosovo. Moreover, 98 percent of precision munitions relied on space for guidance information. In fact, “[i]t may be said that America’s victory in the Kosovo War could not [have been] achieved without fully exploiting space.”38
To this end, the PLA has been developing a range of anti-satellite capabilities that include both hard-kill and soft-kill systems. The former include direct-ascent kinetic-kill vehicles (DA-KKV) such as the system famously tested in 2007, but they also include more advanced systems that are believed to be capable of reaching targets in mid-Earth orbit and even geosynchronous orbit.39 The latter include anti-satellite lasers for either dazzling or blinding purposes.40 This is consistent with PLA doctrinal writings, which emphasize the need to control space in future conflicts. “Securing space dominance has already become the prerequisite for establishing information, air, and maritime dominance,” says one Chinese teaching manual, “and will directly affect the course and outcome of wars.”41
Soft-kill attacks need not come only from dedicated weapons, however. The case of Galaxy-15, a communications satellite owned by Intelsat Corporation, showed how a satellite could disrupt communications simply by always being in “switched on” mode.42 Before it was finally brought under control, it had drifted through a portion of the geosynchronous belt, forcing other satellite owners to move their assets and juggle frequencies. A deliberate such attempt by China (or any other country) could prove far harder to handle, especially if conducted in conjunction with attacks by kinetic systems or directed-energy weapons.
Most recently, China has landed an unmanned probe at the lunar south pole on the far side of the Moon. This is a major accomplishment because the probe is the first spacecraft ever to land at either of the Moon’s poles. To support this mission, the Chinese deployed a data relay satellite to Lagrange Point-2, one of five points where the gravity wells of the Earth and Sun “cancel out” each other, allowing a satellite to remain in a relatively fixed location with minimal fuel consumption. While the satellite itself may or may not have military roles, the deployment highlights that China will now be using the enormous volume of cis-lunar space (the region between the Earth and the Moon) for various deployments. This will greatly complicate American space situational awareness efforts by forcing the U.S. to monitor a vastly greater area of space for possible Chinese spacecraft. The Chinese Chang’e-5 lunar sample retrieval mission in 2020 and the recent Chinese landing on Mars underscore China’s effort to move beyond Earth orbit to cis-lunar and interplanetary space.
Cyber Activities and the Electromagnetic Domain. As far back as 2013, the Verizon Risk Center identified China as the “top external actor from which [computer] breaches emanated, representing 30 percent of cases where country-of-origin could be determined.”43 Given the difficulties of attribution, country of origin should not necessarily be conflated with perpetrator, but forensic efforts have associated at least one Chinese military unit with cyber intrusions, albeit many years ago.44 The Verizon report similarly concluded that China was the source of 95 percent of state-sponsored cyber espionage attacks. Since the 2015 summit meeting between Chinese President Xi Jinping and U.S. President Barack Obama, during which the two sides reached an understanding to reduce cyber economic espionage, Chinese cyber actions have shifted. Although the overall level of activity appears to be unabated, the Chinese seem to have moved toward more focused attacks mounted from new sites.
China’s cyber espionage efforts are often aimed at economic targets, reflecting China’s much more holistic view of both security and information. Rather than creating an artificial dividing line between military security and civilian security, much less information, the PLA plays a role in supporting both aspects and seeks to obtain economic intellectual property as well as military electronic information.
This is not to suggest that the PLA has not emphasized the military importance of cyber warfare. Chinese military writings since the 1990s have emphasized a fundamental transformation in global military affairs. Future wars will be conducted through joint operations involving multiple services, not through combined operations focused on multiple branches within a single service, and will span not only the traditional land, sea, and air domains, but also outer space and cyberspace. The latter two arenas will be of special importance because warfare has shifted from an effort to establish material dominance (characteristic of industrial age warfare) to establishing information dominance. This is due to the rise of the information age and the resulting introduction of information technology into all areas of military operations.
Consequently, according to PLA analysis, future wars will most likely be “informationized local wars.” That is, they will be wars in which information and information technology will be both widely applied and a key basis of victory. The ability to gather, transmit, analyze, manage, and exploit information will be central to winning such wars: The side that is able to do these things more accurately and more quickly will be the side that wins. This means that future conflicts will no longer be determined by platform-versus-platform performance and not even by system against system: Conflicts are now clashes between rival systems of systems.45
Chinese military writings suggest that a great deal of attention has been focused on developing an integrated computer network and electronic warfare (INEW) capability. This would allow the PLA to reconnoiter a potential adversary’s computer systems in peacetime, influence opponent decision-makers by threatening those same systems in times of crisis, and disrupt or destroy information networks and systems by cyber and electronic warfare means in the event of conflict. INEW capabilities would complement psychological warfare and physical attack efforts to secure “information dominance,” which Chinese military writings emphasize as essential for fighting and winning future wars.
It is essential to recognize, however, that the PLA views computer network operations as part of information operations, or information combat. Information operations are specific operational activities that are associated with striving to establish information dominance. They are conducted in both peacetime and wartime with the peacetime focus on collecting information, improving its flow and application, influencing opposing decision-making, and effecting information deterrence.
Information operations involve four mission areas:
- Command and Control Missions. An essential part of information operations is the ability of commanders to control joint operations by disparate forces. Command, control, communications, computers, intelligence, surveillance, and reconnaissance structures therefore constitute a key part of information operations by providing the means for collecting, transmitting, and managing information.
- Offensive Information Missions. These are intended to disrupt the enemy’s battlefield command and control systems and communications networks, as well as to strike the enemy’s psychological defenses.
- Defensive Information Missions. Such missions are aimed at ensuring the survival and continued operation of information systems. They include deterring an opponent from attacking one’s own information systems, concealing information, and combating attacks when they do occur.
- Information Support and Information-Safeguarding Missions. The ability to provide the myriad types of information necessary to support extensive joint operations and to do so on a continuous basis is essential to their success.46
Computer network operations are integral to all four of these overall mission areas. They can include both strategic and battlefield network operations and can incorporate both offensive and defensive measures. They also include protection not only of data, but also of information hardware and operating software.
Finally, computer network operations will not stand alone; they will be integrated with electronic warfare operations as reflected in the phrase “network and electronics unified.” Electronic warfare operations are aimed at weakening or destroying enemy electronic facilities and systems while defending one’s own.47 The combination of electronic and computer network attacks will produce synergies that affect everything from finding and assessing the adversary, to locating one’s own forces, to weapons guidance, to logistical support and command and control. The creation of the PLASSF is intended to integrate these forces and make them more complementary and effective in future “local wars under informationized conditions.”
Threat of Regional War
Three issues, all involving China, threaten American interests and embody the “general threat of regional war” noted at the outset of this section: the status of Taiwan, the escalation of maritime and territorial disputes, and border conflict with India.
Taiwan. China’s long-standing threat to end the de facto independence of Taiwan and ultimately to bring it under the authority of Beijing—by force if necessary—is both a threat to a major American security partner and a threat to the American interest in peace and stability in the Western Pacific.
After easing for eight years, tensions across the Taiwan Strait have worsened as a result of Beijing’s reaction to the outcome of Taiwan’s 2016 and 2020 presidential elections. Beijing has suspended most direct government-to-government discussions with Taipei and is using a variety of aid and investment efforts to deprive Taiwan of its remaining diplomatic partners.
Beijing has also undertaken significantly escalated military activities directed at Taiwan. For example:
- In 2021, China sent more than 150 aircraft into Taiwan’s air defense identification zone.48
- In 2022, 39 Chinese aircraft, including fighters, bombers, and support aircraft, conducted the largest single incursions into Taiwanese airspace.49
- Chinese fighters, along with airborne early warning aircraft, have increased their exercises southwest of Taiwan, demonstrating a growing ability to conduct flexible air operations and reduced reliance on ground-based control.50
- For at least six months in 2021, the Chinese maintained a warship between Taiwan and the string of Japanese islands southwest of Kyushu.51
- The PLA has undertaken sustained joint exercises to simulate extended air operations, employing both air and naval forces including its aircraft carriers.52
These activities continued unabated and, in some ways, even intensified in the wake of China’s struggle with COVID-19.53
Regardless of the state of the relationship at any given time, Chinese leaders from Deng Xiaoping and Mao Zedong to Xi Jinping have consistently emphasized the importance of ultimately reclaiming Taiwan. The island—along with Tibet—is the clearest example of a geographical “core interest” in Chinese policy. China has never renounced the use of force, and it continues to employ political warfare against Taiwan’s political and military leadership.
For the Chinese leadership, the failure to effect unification, whether peacefully or by using force, would reflect fundamental political weakness. For this reason, China’s leaders cannot back away from the stance of having to unify the island with the mainland, and the island remains an essential part of the PLA’s “new historic missions,” shaping its acquisitions and military planning.
It is widely posited that China’s anti-access/area-denial (A2/AD) strategy—the deployment of an array of overlapping capabilities, including anti-ship ballistic missiles (ASBMs), submarines, and long-range cruise missiles, satellites, and cyber weapons—is aimed largely at forestalling American intervention in support of friends and allies in the Western Pacific, including Taiwan. By holding at risk key American platforms and systems (for example, aircraft carriers), the Chinese seek to delay or even deter American intervention in support of key friends and allies, thereby allowing the PRC to achieve a fait accompli. The growth of China’s military capabilities is specifically oriented toward countering America’s ability to assist in the defense of Taiwan.
Moreover, China’s efforts to reclaim Taiwan are not limited to overt military means. The “three warfares” highlight Chinese political warfare methods, including legal warfare/lawfare, public opinion warfare, and psychological warfare. The PRC employs such approaches to undermine both Taiwan’s will to resist and America’s willingness to support Taiwan. The Chinese goal would be to “win without fighting”—to take Taiwan without firing a shot or with only minimal resistance before the United States could organize an effective response.
Escalation of Maritime and Territorial Disputes. The PRC and other countries in the region see active disputes over the East and South China Seas not as differences regarding the administration of international common spaces, but rather as matters of territorial sovereignty. As a result, there exists the threat of armed conflict between China and American allies that are also claimants, particularly Japan and the Philippines.
Because its economic center of gravity is now in the coastal region, China has had to emphasize maritime power to defend key assets and areas. This need is exacerbated by China’s status as the world’s foremost trading state. China increasingly depends on the seas for its economic well-being. Its factories are powered by imported oil, and its diets contain a growing percentage of imported food. China relies on the seas to move its products to markets. Consequently, it not only has steadily expanded its maritime power, including its merchant marine and maritime law enforcement capabilities, but also has acted to secure the “near seas” as a Chinese preserve.
Beijing prefers to accomplish its objectives quietly and through nonmilitary means. In both the East China Sea and the South China Sea, China has sought to exploit “gray zones,” gaining control incrementally and deterring others without resorting to the lethal use of force. It uses military and economic threats, bombastic language, and enforcement through legal warfare (including the employment of Chinese maritime law enforcement vessels) as well as military bullying. Chinese paramilitary-implemented, military-backed encroachment in support of expansive extralegal claims could lead to an unplanned armed clash.
The growing tensions between China and Japan and among a number of claimants in the South China Sea are especially risky. In the former case, the most proximate cause is the dispute over the Senkakus.
China has intensified its efforts to assert claims of sovereignty over the Senkaku Islands of Japan in the East China Sea. Beijing asserts both exclusive economic rights within the disputed waters and recognition of “historic” rights to dominate and control those areas as part of its territory.54 Chinese fishing boats (often believed to be elements of the Chinese maritime militia) and Chinese Coast Guard (CCG) vessels have been encroaching steadily on the territorial waters within 12 nautical miles of the uninhabited islands. In 2020, CCG or other government vessels repeatedly entered the waters around the Senkakus.55 In the summer of 2016, China deployed a naval unit (as opposed to the CCG) into the area.56
Beijing’s 2013 ADIZ declaration was just part of a broader Chinese pattern of using intimidation and coercion to assert expansive extralegal claims of sovereignty and/or control incrementally. For example:
- In June 2016, a Chinese fighter made an “unsafe” pass near a U.S. RC-135 reconnaissance aircraft in the East China Sea area.
- In March 2017, Chinese authorities warned the crew of an American B-1B bomber operating in the area of the ADIZ that they were flying illegally in PRC airspace. In response to the incident, the Chinese Foreign Ministry called for the U.S. to respect the ADIZ.57
- In May 2018, the Chinese intercepted an American WC-135, also over the East China Sea.58
There have been no publicly reported ADIZ-related confrontations since then.
In the South China Sea, overlapping Chinese, Bruneian, Philippine, Malaysian, Vietnamese, and Taiwanese claims raise the prospect of confrontation. This volatile situation has led to a variety of confrontations between China and other claimants, as well as with Indonesia, which is not claiming territory or rights disputed by anyone except (occasionally) China.
China–Vietnam tensions in the region, for example, were on display again in 2020 when CCG vessels twice rammed and sank Vietnamese fishing boats near the disputed Paracel islands.59 Vietnam has also protested China’s decision to create additional administrative regions for the South China Sea, one centered on the Paracels and the other centered on the Spratlys.60 This is part of Beijing’s “legal warfare” efforts, which employ legal and administrative measures to underscore China’s claimed control of the South China Sea region. For this reason, conflict often occurs around Chinese enforcement of unilaterally determined and announced fishing bans.61
Because of the relationship between the Philippines and the United States, tensions between Beijing and Manila are the most likely to lead to American involvement in these disputes. There have been several incidents going back to the 1990s. The most contentious occurred in 2012 when a Philippine naval ship operating on behalf of the country’s coast guard challenged private Chinese poachers in waters around Scarborough Shoal. The resulting escalation left Chinese government ships in control of the shoal, after which the Philippines successfully challenged Beijing in the Permanent Court of Arbitration regarding its rights under the U.N. Convention on the Law of the Sea (UNCLOS). There is no indication that the Chinese have reclaimed land around the shoal as they did in the Spratlys, but they continue to control access to the reef, and the presence of the Chinese Coast Guard remains a source of confrontation.62
In March and April of 2021, a similar dispute seemed to be simmering around Whitsun Reef in the Spratlys. The presence of more than two hundred Chinese fishing boats, among them known assets of China’s maritime militia,63 sparked protests from Manila. After a stay of a few weeks—which Beijing claimed was necessary because of the poor weather—most of the ships departed. The unprecedented gathering of fishing boats and maritime militia could be an attempt to establish a basis within the Philippines exclusive economic zone (EEZ) for a subsequent return backed by the Chinese Coast Guard.
In each of these cases, the situation is exacerbated by rising Chinese nationalism.64 In the face of persistent economic challenges, nationalist themes are becoming an increasingly strong undercurrent and affecting policymaking. Although the nationalist phenomenon is not new, it is gaining force and complicating efforts to maintain regional stability.
Governments may choose to exploit nationalism for domestic political purposes, but they also run the risk of being unable to control the genie that they have released. Nationalist rhetoric is mutually reinforcing, which makes countries less likely to back down than they might have been in the past. The increasing power that the Internet and social media provide to the populace, largely outside of government control, adds elements of unpredictability to future clashes. China’s refusal to accept the 2016 Permanent Court of Arbitration findings, which overwhelmingly favored the Philippines, despite both Chinese and Philippine accession to UNCLOS is a partial reflection of such trends.
In case of armed conflict between China and the Philippines or between China and Japan, either by intention or because of an accidental incident at sea, the U.S. could be required to exercise its treaty commitments.65 Escalation of a direct U.S.–China incident is also not unthinkable. Keeping an inadvertent incident from escalating into a broader military confrontation would be difficult. This is particularly true in the East and South China Seas, where naval as well as civilian law enforcement vessels from both China and the U.S. operate in what the U.S. considers to be international waters.
The most significant development in the South China Sea during the past three years has been Chinese reclamation and militarization of seven artificial islands or outposts. In 2015, President Xi promised President Obama that China had no intention of militarizing the islands. That pledge has never been honored.66 In fact, as described by Admiral John Aquilino, Commander, U.S. Indo-Pacific Command, in his March 2022 posture statement to the Senate Committee on Armed Services:
[T]he PLA has deployed anti-ship cruise missiles, surface-to-air missiles, and jamming equipment to its artificial Spratly Islands features since 2018 and flown aircraft from those locations since 2020. The PLA has emplaced expansive military infrastructure in the SCS by building aircraft hangars sufficient to accommodate multiple fighter brigades, protective shelters for surface-to-air and anti-ship missiles, and significant fuel storage facilities.67
According to the DOD’s 2021 annual report on the Chinese military, “[n]o substantial land has been reclaimed at any of the outposts since the PRC completed its extensive artificial manipulation in the Spratly Islands in late 2015, after adding more than 3,200 acres of land to the seven features it occupies in the Spratlys.”68 This would seem to suggest that the process has been completed.
There is the possibility that China will ultimately try to assert its authority over the entire area by declaring an ADIZ above the South China Sea.69 There also are concerns that under the right circumstances, China will move against vulnerable targets like Philippines-occupied Second Thomas Shoal or Reed Bank, where a Chinese fishing boat in 2019 rammed and sank a Philippine boat, causing a controversy in Manila. There is also consistent speculation in the Philippines about when the Chinese will start reclamation work at Scarborough. This development in particular would facilitate the physical assertion of Beijing’s claims and enforcement of an ADIZ, regardless of the UNCLOS award.
Border Conflict with India. The possibility of armed conflict between India and China, while currently remote, poses an indirect threat to U.S. interests because it could disrupt the territorial status quo and raise nuclear tensions in the region. A border conflict between India and China could also prompt Pakistan to add to regional instability by trying to take advantage of the situation.
Long-standing border disputes that led to a Sino–Indian war in 1962 have again become a flashpoint in recent years. In April 2013, the most serious border incident between India and China in more than two decades occurred when Chinese troops settled for three weeks several miles inside northern Indian territory on the Depsang Plains in Ladakh. A visit to India by Chinese President Xi Jinping in September 2014 was overshadowed by another flare-up in border tensions when hundreds of Chinese PLA forces reportedly set up camps in the mountainous regions of Ladakh, prompting Indian forces to deploy to forward positions in the region. This border standoff lasted three weeks until both sides agreed to pull their troops back to previous positions.
In 2017, Chinese military engineers were building a road to the Doklam plateau, an area claimed by both Bhutan and China, and this led to a confrontation between Chinese and Indian forces, the latter requested by Bhutanese authorities to provide assistance. The crisis lasted 73 days; both sides pledged to pull back, but Chinese construction efforts in the area have continued.70 Improved Chinese infrastructure not only would give Beijing the diplomatic advantage over Bhutan, but also could make the Siliguri corridor that links the eastern Indian states with the rest of the country more vulnerable.
In June 2020, the situation escalated even further. Clashes between Indian and Chinese troops using rocks, clubs, and fists led to at least 20 Indian dead and (as the Chinese authorities recently admitted) at least four Chinese killed in the Galwan Valley area of Ladakh.71 In September, reports of shots exchanged near the Pangong Lake region signaled further potential escalation.72
India claims that China occupies more than 14,000 square miles of Indian territory in the Aksai Chin along its northern border in Kashmir, and China lays claim to more than 34,000 square miles of India’s northeastern state of Arunachal Pradesh. The issue is also closely related to China’s concern for its control of Tibet and the presence in India of the Tibetan government in exile and Tibet’s spiritual leader, the Dalai Lama.
China is building up military infrastructure and expanding a network of road, rail, and air links in its southwestern border areas. To meet these challenges, the Indian government has committed to expanding infrastructure development along the disputed border, although China currently holds a decisive military edge.
China presents the United States with the region’s most comprehensive security challenge. It poses various threat contingencies across all three areas of vital American national interests: homeland; regional war, including potential attacks on overseas U.S. bases as well as against allies and friends; and international common spaces. China’s provocative behavior is well documented. It is challenging the U.S. and its allies such as Japan at sea, in the air, and in cyberspace; it has raised concerns on its border with India; and it is a standing threat to Taiwan. Despite a lack of official transparency, publicly available sources shed considerable light on China’s rapidly growing military capabilities.
The Chinese launched their first homegrown aircraft carrier during the past year and are fielding large numbers of new platforms for their land, sea, air, and outer-space forces as well as in the electromagnetic domain. The PLA has been staging larger and more comprehensive exercises, including major exercises in the East China Sea near Taiwan, that are improving the ability of the Chinese to operate their abundance of new systems. It also has continued to conduct probes of both the South Korean and Japanese ADIZs, drawing rebukes from both Seoul and Tokyo.
This Index assesses the overall threat from China, considering the range of contingencies, as “aggressive” for level of provocation of behavior and “formidable” for level of capability.
 President Joseph R. Biden, Jr., “Interim National Security Strategic Guidance,” The White House, March 2021, p. 8, https://www.whitehouse.gov/wp-content/uploads/2021/03/NSC-1v2.pdf (accessed May 23, 2022).
 The size of a country’s economy can be measured in nominal terms as adjusted for underlying differences in the cost to produce a good—an adjustment known as purchasing power parity (PPP). In nominal GDP, the U.S. economy is larger than China’s; adjusted for PPP, China’s economy is larger than that of the U.S. See Graham Allison, Nathalie Kiersznowski, and Charlotte Fitzek, “The Great Economic Rivalry: China vs the U.S.,” Harvard Kennedy School, Belfer Center for Science and International Affairs, Avoiding Great Power War Project, March 23, 2022, https://www.belfercenter.org/sites/default/files/files/publication/GreatEconomicRivalry_Final_2.pdf (accessed September 30, 2022).
 Anastasia Lloyd-Damnjanovic, “Beijing’s Deadly Game: Consequences of Excluding Taiwan from the World Health Organization During the COVID-19 Pandemic,” U.S.–China Economic and Security Review Commission Issue Brief, May 12, 2020, p. 2, https://www.uscc.gov/sites/default/files/2020-05/Beijings_Deadly_Game_Excluding_Taiwan_from_WHO_during_COVID-19_Pandemic.pdf (accessed May 23, 2022).
 Joel Wuthnow and Phillip C. Saunders, Chinese Military Reform in the Age of Xi Jinping: Drivers, Challenges, and Implications, National Defense University, Institute for National Strategic Studies, Center for the Study of Chinese Military Affairs, China Strategic Perspectives No. 10, March 2017, passim, https://ndupress.ndu.edu/Portals/68/Documents/stratperspective/china/ChinaPerspectives-10.pdf (accessed May 23, 2022).
 U.S. Department of Defense, Defense Intelligence Agency, China Military Power: Modernizing a Force to Fight and Win, 2019, pp. 58–60, https://apps.dtic.mil/sti/pdfs/AD1066163.pdf (accessed May 23, 2022).
 Ronald O’Rourke, “China Naval Modernization: Implications for U.S. Navy Capabilities—Background and Issues for Congress,” Congressional Research Service Report for Members and Committees of Congress No. RL33153, updated March 8, 2022, p. 2, https://fas.org/sgp/crs/row/RL33153.pdf (accessed May 23, 2022). See also Table 2, “Numbers of Chinese and U.S. Navy Battle Force Ships, 2000–2030,” in ibid., p. 9.
 U.S. Department of Defense, Office of the Secretary of Defense, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2021, p. 49, https://media.defense.gov/2021/Nov/03/2002885874/-1/-1/0/2021-CMPR-FINA L.PDF (accessed May 23, 2022).
 Dennis Gormley, Andrew S. Erickson, and Jingdong Yuan, “A Potent Vector: Assessing Chinese Cruise Missile Developments,” Joint Force Quarterly No. 75 (4th Quarter 2014), pp. 98–105, https://ndupress.ndu.edu/Portals/68/Documents/jfq/jfq-75/jfq-75_98-105_Gormley-et-al.pdf (accessed May 23, 2022).
 U.S. Department of Defense, Office of the Secretary of Defense, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2021, pp. 49.
 Ibid., p. 52.
 U.S. Department of Defense, Defense Intelligence Agency, China Military Power: Modernizing a Force to Fight and Win, p. 70.
 Section II, “National Defense Policy,” in People’s Republic of China, Ministry of National Defense, White Paper, China’s National Defense in 2010, March 2011, http://eng.mod.gov.cn/publications/2021-06/23/content_4887922.htm (accessed May 23, 2022).
 Kristin Huang, “Shandong Aircraft Carrier Group Concludes South China Sea Exercise,” South China Morning Post, May 2, 2021, https://www.scmp.com/news/china/military/article/3131977/shandong-aircraft-carrier-group-concludes-south-china-sea (accessed May 23, 2022).
 Franz-Stefan Gady, “China’s New Aircraft Carrier to Use Advanced Jet Launch System,” The Diplomat, November 6, 2017, https://thediplomat.com/2017/11/chinas-new-aircraft-carrier-to-use-advanced-jet-launch-system/ (accessed May 23, 2022).
 U.S. Department of Defense, Office of the Secretary of Defense, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2021, p. 61.
 International Institute for Strategic Studies, The Military Balance 2022: The Annual Assessment of Global Military Capabilities and Defence Economics (London: Routledge, 2022), pp. 260–261.
 U.S. Department of Defense, Office of the Secretary of Defense, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2021, p. 145.
 U.S. Department of Defense, Office of the Secretary of Defense, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2019, p. 58, https://media.defense.gov/2019/May/02/2002127082/-1/-1/1/2019_CHINA_MILITARY_POWER_REPORT.pdf (accessed May 23, 2022).
 U.S. Department of Defense, Office of the Secretary of Defense, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2021, p. 55.
 Franz-Stefan Gady, “Russia Delivers 1st S-400 Missile Defense Regiment to China,” The Diplomat, April 3, 2018, https://thediplomat.com/2018/04/russia-delivers-1st-s-400-missile-defense-regiment-to-china/ (accessed May 23, 2022).
 Andrew S. Erickson and Michael S. Chase, “China’s SSBN Forces: Transitioning to the Next Generation,” Jamestown Foundation China Brief, Vol. 9, Issue 12 (June 12, 2009), http://www.jamestown.org/single/?no_cache=1&tx_ttnews[tt_news]=35120#.U5G0OSjb5NQ (accessed May 23, 2022).
 U.S. Department of Defense, Office of the Secretary of Defense, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2019, p. 45.
 U.S. Department of Defense, Office of the Secretary of Defense, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2021, p. 62.
 Brad Lendon, “China Is Building a Sprawling Network of Missile Silos, Satellite Imagery Appears to Show,” CNN, updated July 2, 2021, https://www.cnn.com/2021/07/02/asia/china-missile-silos-intl-hnk-ml/index.html (accessed May 23, 2022); Matt Korda and Hans Kristensen, “China Is Building a Second Nuclear Missile Silo Field,” Federation of American Scientists, Strategic Security Blog, July 26, 2021, https://fas.org/blogs/security/2021/07/china-is-building-a-second-nuclear-missile-silo-field/ (accessed May 23, 2022); and Shannon Bugos and Julia Masterson, “New Chinese Missile Silo Fields Discovered,” Arms Control Today, September 2021, https://www.armscontrol.org/act/2021-09/news/new-chinese-missile-silo-fields-discovered (accessed May 23, 2022).
 U.S. Department of Defense, Office of the Secretary of Defense, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2021, p. 49.
 For more information on China’s cruise missile program, see Dennis M. Gormley, Andrew S. Erickson, and Jingdong Yuan, A Low-Visibility Force Multiplier: Assessing China’s Cruise Missile Ambitions (Washington: National Defense University Press, 2014), http://ndupress.ndu.edu/Portals/68/Documents/Books/force-multiplier.pdf (accessed May 23, 2022). Published by the NDU Press for the Center for the Study of Chinese Military Affairs, “established as an integral part of the National Defense University’s Institute for National Strategic Studies on March 1, 2000.”
 U.S. Department of Defense, Office of the Secretary of Defense, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2021, pp. 61 (DF-21) and 78 (DF-26).
 Chandelis Duster, “Top Military Leader Says China’s Hypersonic Missile Test ‘Went Around the World,’” CNN, updated November 18, 2021, https://www.cnn.com/2021/11/17/politics/john-hyten-china-hypersonic-weapons-test/index.html (accessed May 23, 2022).
 Press release, “U.S. Charges Five Chinese Military Hackers for Cyber Espionage Against U.S. Corporations and a Labor Organization for Commercial Advantage,” U.S. Department of Justice, May 19, 2014, https://www.justice.gov/opa/pr/us-charges-five-chinese-military-hackers-cyber-espionage-against-us-corporations-and-labor (accessed May 23, 2022).
 BBC News, “Equifax: US Charges Four Chinese Military Officers over Huge Hack,” February 11, 2020, https://www.bbc.com/news/world-us-canada-51449778 (accessed May 23, 2022).
 Andrew Jones, “China’s Shijian-21 Towed Dead Satellite to a High Graveyard Orbit,” SpaceNews, January 27, 2022, https://spacenews.com/chinas-shijian-21-spacecraft-docked-with-and-towed-a-dead-satellite/ (accessed May 23, 2022).
 National Air and Space Intelligence Center, “Competing in Space,” December 2018, p. 21, https://media.defense.gov/2019/Jan/16/2002080386/-1/-1/1/190115-F-NV711-0002.PDF (accessed May 23, 2022).
 Gregory B. Poling, “The Conventional Wisdom on China’s Island Bases Is Dangerously Wrong,” War on the Rocks, January 10, 2020, https://warontherocks.com/2020/01/the-conventional-wisdom-on-chinas-island-bases-is-dangerously-wrong/ (accessed May 23, 2022), and J. Michael Dahm, “Beyond ‘Conventional Wisdom’: Evaluating the PLA’s South China Sea Bases in Operational Context,” War on the Rocks, March 17, 2020, https://warontherocks.com/2020/03/beyond-conventional-wisdom-evaluating-the-plas-south-china-sea-bases-in-operational-context/ (accessed May 23, 2022).
 Associated Press, “U.S. Admiral Says China Has Fully Militarized Islands,” Politico, March 20, 2022, https://www.politico.com/news/2022/03/20/china-islands-militarized-missiles-00018737 (accessed May 23, 2022).
 “Building an Active, Layered Defense: Chinese Naval and Air Force Advancement,” interview with Andrew S. Erickson, U.S. Naval War College, by Greg Chaffin, National Bureau of Asian Research, September 10, 2012, https://www.nbr.org/publication/building-an-active-layered-defense-chinese-naval-and-air-force-advancement/ (accessed May 23, 2022).
 Patrick M. Cronin and Ryan D. Neuhard, “Countering China’s Laser Offensive,” The Diplomat, April 2, 2020, https://thediplomat.com/2020/04/countering-chinas-laser-offensive/ (accessed May 23, 2022).
 Xinhua, “China Announces Success in Technology to Refuel Satellites in Orbit,” June 30, 2016, http://www.china.org.cn/china/Off_the_Wire/2016-06/30/content_38784419.htm (accessed May 23, 2022).
 Mei Lianju, Space Operations Teaching Materials (Beijing, PRC: Academy of Military Sciences Publishing House, 2013), p. 65.
 See, for example, Brian Weeden, Through a Glass, Darkly: Chinese, American, and Russian Anti-Satellite Testing in Space, Secure World Foundation, March 17, 2014, https://swfound.org/media/167224/through_a_glass_darkly_march2014.pdf (accessed May 23, 2022).
 Ian Easton, “The Great Game in Space: China’s Evolving ASAT Weapons Programs and Their Implications for Future U.S. Strategy,” Project 2049 Institute, 2009, pp. 4–5, https://project2049.net/wp-content/uploads/2018/05/china_asat_weapons_the_great_game_in_space.pdf (accessed May 23, 2022).
 Mei Lianju, Space Operations Teaching Materials, p. 69.
 Peter B. de Selding, “Runaway Zombie Satellite Galaxy 15 Continues to Pose Interference Threat,” Space.com, October 15, 2010, http://www.space.com/9340-runaway-zombie-satellite-galaxy-15-continues-pose-interference-threat.html (accessed May 23, 2022). Article “provided by SpaceNews.”
 Verizon, 2013 Data Breach Investigations Report, pp. 21–22, https://cybersecurity.idaho.gov/wp-content/uploads/sites/87/2019/04/data-breach-investigations-report-2013.pdf (accessed May 23, 2022). See also Elise Ackerman, “New Verizon Security Report Finds a Growing Number of Attacks by China’s Hacker Army,” Forbes, April 23, 2013, https://www.forbes.com/sites/eliseackerman/2013/04/23/new-verizon-security-report-finds-a-growing-number-of-attacks-by-chinas-hacker-army/#11429f622c49 (accessed May 23, 2022), and Lucian Constantin, “Verizon: One in Five Data Breaches Are the Result of Cyberespionage,” PC World, April 23, 2013, http://www.pcworld.com/article/2036177/one-in-five-data-breaches-are-the-result-of-cyberespionage-verizon-says.html (accessed May 23, 2022).
 Mike Lennon, “Unit in China’s PLA Behind Massive Cyber Espionage Units,” SecurityWeek, February 18, 2013, https://www.securityweek.com/cyber-unit-chinas-pla-behind-massive-cyber-espionage-operation-report (accessed May 23, 2022). For the full report, see Mandiant, APT1: Exposing One of China’s Cyber Espionage Units, https://www.mandiant.com/sites/default/files/2021-09/mandiant-apt1-report.pdf (accessed May 23, 2022).
 Bai Bangxi and Jiang Lijun, “‘Systems Combat’ Is Not the Same as ‘System Combat,’” China National Defense Newspaper, January 10, 2008, cited in Dean Cheng, “U.S.–China Competition in Space,” testimony before the Subcommittee on Space, Committee on Science, Space, and Technology, U.S. House of Representatives, September 27, 2016, p. 2, https://docs.house.gov/meetings/SY/SY16/20160927/105387/HHRG-114-SY16-Wstate-ChengD-20160927.pdf (accessed May 23, 2022).
 Guo Ruobing, Theory of Military Information Security (Beijing, PRC: National Defense University Publishing House, 2013), pp. 12–21.
 Tan Rukan, Building Operational Strength Course Materials (Beijing, PRC: Academy of Military Sciences Publishing House, 2012), p. 204.
 Helen Davidson, “China Sends Largest Incursion of Warplanes into Taiwan Defence Zone Since October,” The Guardian, January 24, 2022, https://www.theguardian.com/world/2022/jan/24/china-sends-largest-incursion-of-warplanes-into-taiwan-defence-zone-since-october (accessed May 23, 2022).
 Reuters, “Taiwan Reports New Large-Scale Chinese Air Force Incursion,” January 24, 2022, https://www.reuters.com/world/asia-pacific/taiwan-reports-new-large-scale-chinese-air-force-incursion-2022-01-23/ (accessed May 23, 2022).
 Reuters, “Taiwan Air Force Scrambles Again to Warn off Chinese Jets,” Al Jazeera, March 16, 2020, https://www.aljazeera.com/news/2020/03/taiwan-airforce-scrambles-warn-chinese-jets-200317003712908.html (accessed May23, 2022).
 Davidson, “China Sends Largest Incursion of Warplanes into Taiwan Defence Zone Since October.”
 Kristin Huang, “Chinese Air Force’s Drill ‘Aimed at Signalling Deterrent Around Taiwan,’” South China Morning Post, April 2, 2020, https://www.scmp.com/news/china/military/article/3077997/chinese-air-forces-drill-aimed-signalling-deterrent-around (accessed May 23, 2022).
 Erin Hale, “In Shadow of Coronavirus, China Steps up Manoeuvres Near Taiwan,” Al Jazeera, April 23, 2020, https://www.aljazeera.com/news/2020/04/shadow-coronavirus-china-steps-manoeuvres-taiwan-200422011542456.html (accessed May 23, 2022), and Yew Lun Tian and Ben Blanchard, “China Rattles Sabres as World Battles Coronavirus Pandemic,” Reuters, April 21, 2020, https://www.reuters.com/article/us-china-security/china-rattles-sabres-as-world-battles-coronavirus-pandemic-idUSKBN2230GC (accessed May 23, 2022).
 See Chapter 10, “The South China Sea Tribunal,” in Tufts University, The Fletcher School, Law of the Sea: A Policy Primer, https://sites.tufts.edu/lawofthesea/chapter-ten/ (accessed May 23, 2022).
 Kyodo News, “Japan Lodges Protests Against Chinese Maritime Intrusions Near Senkakus,” The Japan Times, April 22, 2020, https://www.japantimes.co.jp/news/2020/04/22/national/japan-protest-chinese-intrusions-senkakus/ (accessed May 23, 2022).
 Ankit Panda, “Japan Identifies Chinese Submarine in East China Sea: A Type 093 SSN,” The Diplomat, January 16, 2018, https://thediplomat.com/2018/01/japan-identifies-chinese-submarine-in-east-china-sea-a-type-093-ssn/ (accessed May 23, 2022); Howard Wang, “China vs. Japan: Is the East China Sea Showdown Back on?” The National Interest, The Buzz Blog, June 7, 2019, https://nationalinterest.org/blog/buzz/china-vs-japan-east-china-sea-showdown-back-61492 (accessed May 23, 2022); and Ankit Panda, “China Patrol Ships Sustain Presence Near Senkaku Islands: Report,” The Diplomat, June 10, 2019, https://thediplomat.com/2019/06/china-patrol-ships-sustain-presence-near-senkaku-islands-report/ (accessed May 23, 2022).
 Jason Le Miere, “China Claims U.S. Military Plane ‘Illegally’ Entered Chinese Air Defense Zone,” Newsweek, March 24, 2017, http://www.newsweek.com/china-claims-us-military-plane-illegally-entered-chinese-air-defense-zone-573711 (accessed May 23, 2022).
 Hans Nichols and Courtney Kube, “Two Chinese Fighter Jets Intercept U.S. Plane over East China Sea, Officials Say,” NBC News, updated May 18, 2017, http://www.nbcnews.com/news/us-news/two-chinese-fighter-jets-intercept-u-s-plane-officials-say-n761931 (accessed May 23, 2022).
 Khanh Vu, “Vietnam Protests Beijing’s Sinking of South China Sea Boat,” Reuters, April 4, 2020, https://www.reuters.com/article/us-vietnam-china-southchinasea/vietnam-protests-beijings-sinking-of-south-china-sea-boat-idUSKBN21M072 (accessed May 23, 2022), and “Chinese Vessel Rams Vietnamese Fishing Boat in S. China Sea,” The Maritime Executive, June 14, 2020, https://www.maritime-executive.com/article/report-chinese-vessel-rams-vietnamese-fishing-boat-in-s-china-sea (accessed May 23, 2022).
 Reuters, “Vietnam Protests Beijing’s Expansion in Disputed South China Sea,” April 19, 2020, https://www.reuters.com/article/us-vietnam-china-southchinasea/vietnam-protests-beijings-expansion-in-disputed-south-china-sea-idUSKBN2210M7 (accessed May 23, 2022).
 Tam Anh, “Vietnam Rejects China’s Illegal Fishing Ban,” Vn Express International, April 29, 2021, https://e.vnexpress.net/news/news/vietnam-rejects-china-s-illegal-fishing-ban-4270611.html (accessed May 23, 2022).
 Andreo Calonzo, “Philippines Slams China’s ‘Dangerous’ Move in Disputed Sea,” Bloomberg, updated May 3, 2021, https://www.bloomberg.com/news/articles/2021-05-03/philippines-dials-up-protest-on-china-s-dangerous-sea-maneuver?sref=InMWfBxD (accessed May 23, 2022), and Reuters and Bloomberg, “Philippines Foreign Minister Issues Expletive-Laced Tweet over South China Sea Dispute,” The Straits Times, updated May 4, 2021, https://www.straitstimes.com/asia/se-asia/philippines-slams-china-for-dangerous-manoeuvre-in-disputed-south-china-sea (accessed May 23, 2022).
 Center for Strategic and International Studies, Asia Transparency Initiative, “Caught on Camera: Two Dozen Militia Boats at Whitsun Reef Identified,” April 21, 2021, https://amti.csis.org/caught-on-camera-two-dozen-militia-boats-at-whitsun-reef-identified/ (accessed May 23, 2022).
 “Philippines Has Ulterior Motives to Suddenly Hype up the Matter over Niu’e Jiao,” Global Times, April 5, 2021, https://www.globaltimes.cn/page/202104/1220284.shtml (accessed May 23, 2022).
 Although it has long been a matter of U.S. policy that Philippine territorial claims in the South China Sea lie outside the scope of American treaty commitments, the treaty does apply in the event of an attack on Philippine “armed forces, public vessels or aircraft in the Pacific.” Mutual Defense Treaty Between the United States and the Republic of the Philippines, August 30, 1951, Article V, http://avalon.law.yale.edu/20th_century/phil001.asp (accessed May 23, 2022). In any event, Article IV of the treaty obligates the U.S. in case of such an attack to “meet the common dangers in accordance with its constitutional processes.” Regardless of formal treaty obligations, however, enduring U.S. interests in the region and perceptions of U.S. effectiveness and reliability as a check on growing Chinese ambitions would likely spur the U.S. to become involved.
 See, for example, Center for Strategic and International Studies, Asia Maritime Transparency Initiative, “An Accounting of China’s Deployments to the Spratly Islands,” May 9, 2018, https://amti.csis.org/accounting-chinas-deployments-spratly-islands/ (accessed May 23, 2022).
 Admiral John C. Aquilino, U.S. Navy, Commander, U.S. Indo-Pacific Command, statement on “U.S. Indo-Pacific Command Posture” before the Committee on Armed Services, U.S. Senate, March 10, 2022, p. 7, https://www.armed-services.senate.gov/imo/media/doc/INDOPACOM%20Statement%20(ADM%20Aquilino)%20_SASC2.PDF (accessed May 23, 2022).
 U.S. Department of Defense, Annual Report to Congress: Military and Security Developments Involving the People’s Republic of China 2021, p. 104.
 Kelvin Chen, “China to Set up ADIZ in South China Sea,” Taiwan News, May 5, 2020, https://www.taiwannews.com.tw/en/news/3928503 (accessed May 23, 2022).
 Joel Wuthnow, Satu Limaye, and Nilanthi Samaranayake, “Doklam, One Year Later: China’s Long Game in the Himalayas,” War on the Rocks, June 7, 2018, https://warontherocks.com/2018/06/doklam-one-year-later-chinas-long-game-in-the-himalayas/ (accessed May 23, 2022).
 BBC News, “Ladakh: China Reveals Soldier Deaths in India Border Clash,” February 19, 2021, https://www.bbc.com/news/world-asia-56121781 (accessed May 23, 2022).
 BBC News, “China Says Indian Troops Fired ‘Provocative’ Shots in Border Dispute,” September 8, 2020, https://www.bbc.com/news/world-asia-china-54067400 (accessed May 23, 2022).