The term Iran Nuclear Deal most commonly refers to the Joint Comprehensive Plan of Action (JCPOA), a July 2015 agreement between Iran and the P5+1 group (China, France, Russia, the United Kingdom, and the United States, plus Germany), together with the European Union, that limited Iran's nuclear program in exchange for relief from nuclear-related sanctions. The agreement was finalized in Vienna on 14 July 2015 and was endorsed by United Nations Security Council Resolution 2231. The deal restricted uranium enrichment levels, centrifuge numbers, and stockpiles, and subjected Iran to expanded International Atomic Energy Agency (IAEA) monitoring. The United States withdrew from the agreement in 2018 under President Donald Trump, after which Iran progressively exceeded the deal's limits. Iran formally announced termination of the agreement on 18 October 2025, ten years after its adoption. Since February 2026, a separate U.S.-Iran negotiating process-following a months-long military conflict-has produced an interim memorandum of understanding addressing Iran's nuclear program; whether this constitutes a successor “Iran nuclear deal” or a distinct arrangement is itself a matter of ongoing characterization. See iran-nuclear-deal-term-naming-viewpoint for differing views on how the term should be applied to post-2025 developments. For background on the broader history, see iran-nuclear-deal-history.

As of late June 2026, no comprehensive replacement for the JCPOA is in force. On 17 June 2026, President Trump and Iranian President Masoud Pezeshkian signed a memorandum of understanding laying out terms for ending a months-long war and reopening the Strait of Hormuz, starting a 60-day negotiating window to resolve outstanding questions about Iran's nuclear program. The 14-point memorandum leaves a number of questions unanswered, and Iranian officials have disputed parts of the United States' published account of its terms.

Under the memorandum, Iran reaffirmed that it would not pursue nuclear weapons, with a mechanism still to be agreed for handling its enriched-uranium stockpile, while the United States committed to lifting sanctions in proportion to Iran's compliance. IAEA Director General Rafael Grossi has stated the interim agreement provides for IAEA inspection access to Iranian nuclear sites, though Iran has disputed that any new inspection arrangement was agreed. Technical talks on verification were reported to be underway in late June 2026. The episode has drawn comparisons to the original 2015 deal, including from former President Barack Obama, who expressed doubt that any Trump-negotiated agreement would differ substantially from the JCPOA.

Separately, the IAEA's basis for monitoring is degraded relative to the JCPOA era: the agency has reported being unable to satisfactorily monitor Iran's nuclear activities since February 2021, and Iran progressively increased enrichment and barred international inspectors after 2019, with stockpiles reaching levels assessed in 2023 as sufficient for a relatively short breakout to weapons-grade material, though estimates of actual weaponization timelines vary and are contested. The full sequence of military escalation, negotiation, and collapse between 2018 and 2026 is addressed at iran-nuclear-deal-history.

• Non-proliferation success framing: holds that the 2015 JCPOA was an effective, verifiable constraint on Iran's nuclear capabilities while in force, and that its collapse-not its design-produced the deterioration in monitoring and stockpiles seen after 2018. See iran-nuclear-deal-jcpoa-effective-viewpoint.
• Inadequate-deal / sunset-clause critique: holds that the JCPOA's time-limited restrictions and failure to address missile development or regional proxy funding made it insufficient, justifying U.S. withdrawal. See iran-nuclear-deal-jcpoa-inadequate-viewpoint.
• Withdrawal-as-strategic-error viewpoint: holds that U.S. withdrawal in 2018 removed functioning constraints and monitoring without securing a better alternative, contributing to the expansion of Iran's program. See iran-nuclear-deal-withdrawal-error-viewpoint.
• Maximum-pressure-vindicated viewpoint: holds that sustained sanctions and, eventually, military pressure compelled Iran to negotiate the 2026 memorandum on terms more favorable to the United States than the original deal. See iran-nuclear-deal-maximum-pressure-viewpoint.
• Military-action-was-necessary viewpoint: holds that diplomacy alone, including any prior or future negotiated agreement, cannot reliably prevent Iran from developing nuclear weapons, making the use of force in 2026 justified or unavoidable. See iran-nuclear-deal-military-necessity-viewpoint.
• Diplomacy-undermined-by-war viewpoint: holds that military escalation foreclosed a verifiable diplomatic outcome and that the 2026 memorandum is weaker on verification than the 2015 deal it replaced. See iran-nuclear-deal-diplomacy-undermined-viewpoint.

• Dispute over whether the 2018 U.S. withdrawal from the JCPOA was a justified response to a flawed agreement or a unilateral abrogation that triggered Iran's subsequent nuclear advances. See iran-nuclear-deal-withdrawal-controversy.
• Disagreement between the United States and Iran over the published content and inspection provisions of the June 2026 memorandum of understanding, including whether Iran agreed to renewed IAEA site access. See iran-nuclear-deal-2026-memorandum-controversy.
• Dispute over the necessity, legality, and consequences of the February-June 2026 U.S. and Israeli military strikes on Iranian nuclear and military facilities. See iran-nuclear-deal-2026-strikes-controversy.

• iran-nuclear-deal-history - History
• iran-nuclear-deal-withdrawal-error-viewpoint-debate - Viewpoint Debate
• iran-nuclear-deal-2026-memorandum-controversy - Controversy
• iran-nuclear-deal-breakout-time-debate - Debate
• iran-united-states-relations - related Main Topic
• nuclear-non-proliferation-treaty - related Main Topic
• 2026-iran-israel-united-states-war - related Main Topic

1. Arms Control Association, “The Joint Comprehensive Plan of Action (JCPOA) at a Glance,” last modified 2025, https://www.armscontrol.org/factsheets/joint-comprehensive-plan-action-jcpoa-glance.
2. Council on Foreign Relations, “What Is the Iran Nuclear Deal?,” accessed June 27, 2026, https://www.cfr.org/backgrounders/what-iran-nuclear-deal.
3. House of Commons Library, “What Is the Status of Iran's Nuclear Programme and the JCPOA?,” accessed June 27, 2026, https://commonslibrary.parliament.uk/research-briefings/cbp-9870/.
4. “Iran Nuclear Deal,” Wikipedia, last modified June 2026, https://en.wikipedia.org/wiki/Iran_nuclear_deal.
5. “2025-2026 Iran-United States Negotiations,” Wikipedia, last modified June 2026, https://en.wikipedia.org/wiki/2025%E2%80%932026_Iran%E2%80%93United_States_negotiations.
6. Henry Austin et al., “Trump and Iran's President Sign Initial Deal to End War, Open Strait of Hormuz and Ease Sanctions,” NBC News, June 17-18, 2026, https://www.nbcnews.com/world/iran/strait-hormuz-reopen-us-lift-iran-sanctions-14-point-deal-seeking-end-rcna350513.
7. “What the Trump-Iran Agreement Says About Lebanon, Hormuz and Uranium,” Al Jazeera, June 18, 2026, https://www.aljazeera.com/news/2026/6/18/what-the-trump-iran-14-point-plan-says-about-lebanon-hormuz-and-uranium.
8. “U.S.-Iran Peace Deal Grants Access to Tehran's Nuclear Sites, UN Watchdog Says,” CNBC, June 26, 2026, https://www.cnbc.com/2026/06/26/us-iran-peace-deal-nuclear-access.html.
9. “Joint Comprehensive Plan of Action (JCPOA),” Britannica, accessed June 27, 2026, https://www.britannica.com/event/Joint-Comprehensive-Plan-of-Action.