Iran Nuclear Deal: Next Steps

Report Middle East

Iran Nuclear Deal: Next Steps

January 29, 2020 14 min read Download Report

Authors: Peter Brookes, Brett Schaefer and James Phillips


The Iranian regime announced in early January that Tehran will no longer be bound by the technical restrictions of the 2015 Joint Comprehensive Plan of Action (JCPOA, or Iran nuclear deal) that sought to deter Iran’s nuclear weapons program by restricting its use of centrifuges, limiting its uranium stockpile, and mandating international inspections. While awaiting the resolution of the JCPOA Dispute Resolution Mechanism process, the United States should take additional steps by maintaining a strong military deterrent, re-imposing the conventional arms ban through a new Security Council resolution, continuing the maximum pressure sanctions campaign, dissolving the JCPOA, and seeking a stronger, more restrictive, permanent nuclear agreement with Iran that addresses Iran’s nuclear, missile, and terrorism activities.

Key Takeaways

Iran has taken significant steps to violate restrictions of the Iran nuclear deal and recently announced it will no longer abide by other restrictions in the JCPOA.

The regime’s serial violations make it imperative that the U.S. and its allies do more to prevent Iran from developing a nuclear weapon and the means to deliver it.

The Trump Administration’s maximum pressure should continue until Iran agrees to negotiate a more restrictive agreement and changes its destructive behavior.

The Iranian regime announced in early January that Tehran will no longer be bound by the technical restrictions of the 2015 Joint Comprehensive Plan of Action (JCPOA, or Iran nuclear deal) that sought to end Iran’s nuclear weapons ambitions. While Iran has not officially withdrawn from the JCPOA, as the United States did in May 2018, it has formally announced that it will not comply with all of its “commitments” and will discard its “operational limitations” under the nuclear deal.

This most recent announcement follows multiple prior incremental violations of Iran’s commitments under the JCPOA and led France, Germany, and the United Kingdom (E3) to refer the matter to the Joint Commission under the Dispute Resolution Mechanism of the JCPOA.REF The E3 insist that their intent is to preserve the deal and bring Iran back into compliance, but the process could also result in dissolution of the JCPOA and “snapback” of U.N. Security Council sanctions.

While awaiting the resolution of the JCPOA Dispute Resolution Mechanism process, the United States should take additional steps by maintaining a strong military deterrent; extending the conventional arms ban that is set to expire this year by adopting a new Security Council resolution; continuing the maximum-pressure sanctions campaign; dissolving the JCPOA and re-imposing sanctions; and seeking a stronger, more restrictive, permanent nuclear agreement with Iran that addresses Iran’s nuclear, missile, and terrorism activities.

Iranian Non-Compliance

On January 5, the Iranian government announced:

The Islamic Republic of Iran, in the fifth step in reducing its commitments, discards the last key component of its operational limitations in the JCPOA, which is the limit on the number of centrifuges. As such, the Islamic Republic of Iran’s nuclear program no longer faces any operational restrictions, including enrichment capacity, percentage of enrichment, amount of enriched material, and research and development. From here on, Iran’s nuclear program will be developed solely based on its technical needs.REF

As acknowledged in the announcement, this is only the latest step taken by Iran to violate the terms of the JCPOA. According to its own admission and others’ reporting—such as that by the United Nations International Atomic Energy Agency (IAEA)—Iran has repeatedly violated its commitments under the JCPOA. Even as early as 2017, an expert reported, “Iran has repeatedly tested the boundaries of the Joint Comprehensive Plan of Action (JCPOA) and in many cases crossed the line into a violation.”REF

On the first anniversary of the U.S. withdrawal from the nuclear deal, May 8, 2019, Iran announced that it would stop complying with key restrictions set by the agreement and warned that it would exceed limits on enriched uranium and heavy-water stockpiles unless the remaining parties to the nuclear deal—especially Britain, France, and Germany—found a way to protect Iran from U.S. oil and bank sanctions within 60 days, by July 7.REF

Since then, Iran has escalated its noncompliance with the agreement every 60 days, in a series of deliberate, major violations that include:

  • Surpassing the JCPOA’s limits on in-country stockpiles of low enriched uranium (LEU) to beyond 300 kilograms;REF
  • Exceeding the JCPOA’s limits on the enrichment of uranium, which was capped at 3.67 percent and enriching uranium to an estimated 4.5 percent;REF
  • Increasing the number of centrifuges enriching uranium beyond the allowed 5,060 IR-1 centrifuges under the JCPOA;REF
  • Using non-JCPOA-approved, advanced centrifuges for enriching uranium at the Natanz enrichment complex, specifically utilizing IR-4 and IR-6 centrifuges in nuclear research and development programs;REF
  • Beginning enriching uranium at facilities beyond its main enrichment plant at Natanz by introducing uranium gas into the centrifuges at the fortified underground Fordow enrichment facility, which ostensibly was repurposed under the JCPOA as only for research;REF and
  • Surpassing 130 metric tons of heavy water at its Heavy Water Production Plant, which could be used in the production of plutonium, a fissile material for a plutonium-based nuclear weapon.REF

Iran deliberately violated its commitment under the JCPOA as an expression of defiance of the Trump Administration’s maximum-pressure sanctions campaign and to pressure the European Union to help it circumvent U.S. sanctions and assist it economically. Although Iran has announced that it will no longer observe its commitments under the JCPOA, Tehran did not explicitly announce its withdrawal from the agreement and stated that it will continue to cooperate with the IAEA and its inspection regime; however, Iran reportedly may reconsider this cooperation.REF Iran has announced, “If the [economic] sanctions are lifted and Iran benefits from its interests enshrined in the JCPOA, the Islamic Republic is ready to return to its commitments.”REF

Nonetheless, Iran’s provocative actions have understandably raised concerns that Tehran has not shed its nuclear ambitions and may be moving to re-establish its nuclear weapons program. Its actions related to uranium-enrichment levels, its growing enriched-uranium stockpile, and operational centrifuges are particularly alarming.

Path to a Nuclear Weapon

Though uranium is often enriched to 90 percent for use in modern nuclear weapons, uranium enriched to 20 percent is considered “highly enriched.”REF In sufficiently large quantities, uranium enriched to 20 percent could be used to build a nuclear weapon.REF Iran was technologically capable of enriching uranium to 20 percent prior to the JCPOA.REF Under the agreement, Iran agreed for 15 years to limit its use of centrifuges, cap its enrichment to 3.67 percent, and either dilute or dispose of uranium enriched above that level. Notably, the JCPOA merely deferred these and other related activities; it did not prohibit them in perpetuity.

A return to enriching uranium above 3.67 percent reduces the potential time needed—also known as the “breakout time”—for Tehran to amass enough weapons-grade uranium to build a nuclear weapon.REF In addition, more efficient centrifuges at a site such as Fordow, if put to use, would potentially allow Iran to enrich uranium five to 10 times more quickly, according to Iranian officials, should it decide to build a nuclear arsenal.REF Iran’s violation of its JCPOA commitments reduces the breakout time according to one estimate.REF

Expressing deep concern about Iran’s violations of the nuclear deal, the Foreign Ministers of the United Kingdom, France, and Germany released a statement on January 14, which called out Tehran’s violation of “key restrictions set out in the JCPOA.”REF The statement added, “Iran’s actions are inconsistent with the provisions of the nuclear agreement and have increasingly severe and non-reversible proliferation implications. We do not accept the argument that Iran is entitled to reduce compliance with the JCPOA.”REF

As a result, the E3 initiated the Dispute Resolution Mechanism under the agreement, which will lead to a review, negotiations, and the possible re-imposition of previously suspended punitive U.N. economic sanctions, according to the JCPOA.REF This is a significant departure for the E3, who remain committed to preserving the agreement despite the United States’ departure in May 2018, and signals that Iranian efforts to pressure the E3 may have backfired.REF

Next Steps

While awaiting the resolution of the JCPOA Dispute Resolution Mechanism process, the United States should take additional steps to dissuade, deter, or deny Iran from advancing its nuclear program, especially the possibility of the intensification of a program with a military dimension. Specifically, the Trump Administration should:

  • Ensure a positive military balance against Iran in the Middle East. The United States and its allies should continue to maintain a favorable military balance of power against Iran, its allies, and proxies to oppose Iran’s malign activities in the region, including the development of a nuclear weapons program. Sanctions alone are unlikely to stop Iran’s march to a nuclear weapon. Firm diplomacy backed by the credible threat of the use of force is necessary to reach an acceptable resolution of the current crisis. Tehran must understand through Washington’s declaratory policy—as well as through the deployment of American military forces and actions to enforce that policy—that the United States will protect its interests in the region and respond to hostile actions.
  • Maintain the arms-transfer ban on Iran. U.N. Security Council Resolution 2231, which endorsed the JCPOA, also contained other provisions, including a timeline for suspending prior U.N. Security Council sanctions on Iran. One of these measures, a ban on the transfer of conventional weapons to Iran, expires in October. Considering Iran’s international behavior, the Security Council should adopt a new resolution to maintain this ban as soon as possible.REF A failure to do so would allow weapons transfers to Iran that would enhance the threat Tehran already poses to international peace and stability.
  • Continue the maximum-pressure sanctions campaign against Iran. Nuclear programs, especially nuclear weapons programs, are expensive. As such, Washington should seek to prevent the flow of revenue into Tehran’s coffers that might be used for this or other nefarious purposes. The Administration’s maximum-pressure campaign on Iran has successfully constrained the Iranian economy and defense spending.REF Maximum pressure should continue until Iran agrees to negotiate a more restrictive nuclear agreement and changes its behavior, ranging from its support for terrorism; aggressive regional interventions; intimidation efforts through its armed drone, ballistic missile, and cruise missile attacks; and manifest human rights violations.
  • Pull the plug on the JCPOA agreement. Britain, France, and Germany have finally taken the first step by triggering the JCPOA’s Dispute Resolution Mechanism, which could result in the snapback of previously imposed, but suspended, U.N. economic sanctions.REF The U.S. should encourage the E3 to stay the course and reject half measures by Iran in a misguided attempt to resurrect the flawed and risky JCPOA. Iran will not begin to negotiate a new nuclear agreement until it is clear that the old agreement is finally dead and buried. Applying further pressure through the snapback of U.N. sanctions improves the odds that Iran will negotiate a new deal that permanently addresses its nuclear, missile, and terrorism activities.REF
  • Seek a stronger, more restrictive, permanent nuclear agreement with Iran. While exerting pressure on Iran, the door to diplomacy between Washington and Tehran should be kept open. The declared purpose of the Administration’s maximum-pressure campaign is not regime change, but to ultimately bring Iran to the negotiating table to reach an agreement that would permanently bar Tehran from acquiring nuclear weapons and long-range ballistic missiles to deliver them. This would require banning Iran from uranium-enrichment activities and reprocessing and fabricating its own nuclear fuel; dismantling substantial portions of Iran’s nuclear infrastructure, particularly the Fordow and Natanz uranium-enrichment facilities and Arak heavy-water reactor; performing robust inspections on an “anytime, anywhere” basis and real-time monitoring of Iranian nuclear facilities; linking sanctions relief tightly to Iranian compliance; ensuring that Iran comes clean on its past nuclear-weaponization efforts; outlining a clear and rapid process for re-imposing all sanctions if Iran is caught cheating; and imposing effective limitations on the development and testing of long-range and other missiles.REF


Iran is arguably the greatest threat to international peace and security in the world today. Since the adoption of the JCPOA, Iran has encouraged, facilitated, or supported terrorism in the Middle East, Africa, Europe, Latin America, South Asia, and the United States.REF Its military adventurism in Iraq, Syria, and Yemen have caused immeasurable suffering. Tehran’s support of Hamas, Hezbollah, and Palestinian Islamic Jihad threatens Israel, a key U.S. ally.

Iran’s serial violations of the JCPOA raise serious concerns about its nuclear ambitions. The regime’s international behavior makes it imperative that the United States, its allies, and partners take decisive actions to prevent Iran from developing a nuclear weapon and the means to deliver it.

Peter Brookes is Senior Research Fellow for Weapons of Mass Destruction and Counter Proliferation in the Center for National Defense, of the Kathryn and Shelby Cullom Davis Institute for National Security and Foreign Policy, at The Heritage Foundation. Brett D. Schaefer is the Jay Kingham Senior Research Fellow in International Regulatory Affairs in the Margaret Thatcher Center for Freedom, of the Davis Institute. James Phillips is Senior Research Fellow for Middle Eastern Affairs in the Douglas and Sarah Allison Center for Foreign Policy, of the Davis Institute.


Peter Brookes
Peter Brookes

Former Senior Research Fellow, Center for National Defense

Brett Schaefer

Jay Kingham Senior Research Fellow, Margaret Thatcher Center

James Phillips

Former Visiting Fellow, Allison Center