The history of the Iran nuclear deal, formally known as the Joint Comprehensive Plan of Action (JCPOA), reflects a protracted international effort to prevent Iran from developing nuclear weapons capabilities. This complex diplomatic agreement has seen periods of significant progress, subsequent collapse, and ongoing attempts at resuscitation, underscoring persistent geopolitical tensions.
International concerns regarding Iran's nuclear program escalated in the early 2000s, driven by revelations of undeclared nuclear activities. This led to United Nations Security Council sanctions and intensive negotiations involving Iran and the P5+1 group (China, France, Germany, Russia, the United Kingdom, and the United States). After years of intricate diplomacy, the JCPOA was ultimately reached in Vienna in July 2015. Under the agreement, Iran committed to significantly restricting its nuclear program and allowing intrusive international inspections in exchange for the lifting of international sanctions. The deal aimed to ensure the peaceful nature of Iran's nuclear activities by extending the "breakout time" needed to produce weapons-grade fissile material.
The JCPOA faced a critical turning point in May 2018 when the United States unilaterally withdrew from the agreement and reimposed sanctions on Iran. This action, taken despite Iran's continued compliance as certified by the International Atomic Energy Agency (IAEA) at the time, significantly undermined the deal. In response to the US withdrawal and the failure of European signatories to fully mitigate the economic impact of US sanctions, Iran began to incrementally reduce its own commitments under the JCPOA starting in 2019, including increasing uranium enrichment levels and stockpiles beyond the limits set by the agreement.