The U.S. withdrawal from the Joint Comprehensive Plan of Action (JCPOA), announced by President Donald Trump on 2018-05-08, terminated U.S. participation in the 2015 multilateral nuclear agreement with Iran, negotiated by the P5+1 (U.S., UK, France, Germany, Russia, China, and the EU). The purpose was to address perceived deficiencies in the JCPOA, including temporary restrictions on Iran's nuclear activities (sunset clauses), lack of constraints on ballistic missile development, and insufficient curbs on Iran's regional influence and support for proxy groups. Implementation involved the President directing the cessation of U.S. compliance, followed by the Departments of State and Treasury reimposing and expanding nuclear-related sanctions as part of a 'maximum pressure' campaign to compel Iran to negotiate a stronger deal. This unilateral executive action aimed to encourage a multilateral response from other JCPOA parties.