The UN Security Council demanded that Iran suspend uranium enrichment and reprocessing-related activities, setting a compliance deadline and warning of further measures. This marked the start of a formal UN Security Council track that soon escalated into binding sanctions.
The Security Council imposed the first round of sanctions tied to Iran’s nuclear program, including an asset freeze on designated persons/entities and restrictions on sensitive nuclear-related items, and established a sanctions committee to oversee implementation.
The Security Council tightened sanctions, expanded designations for asset freezes, and imposed a ban on Iran’s export of arms and related materiel—deepening multilateral pressure while urging a negotiated solution.
A further UN sanctions round added restrictions including enhanced vigilance over Iranian banks and calls for inspections of cargo linked to proliferation-sensitive activities, broadening the enforcement toolkit against procurement networks.
The Security Council unanimously reaffirmed prior resolutions and demanded full compliance, but did not add new sanctions—reflecting both continued concern and limits on consensus for additional penalties at that moment.
The Security Council adopted a major expansion of sanctions, including stricter arms-related restrictions and broader measures targeting proliferation-sensitive activities and associated entities—often described as the most comprehensive UN round before the JCPOA.
The U.S. expanded secondary sanctions targeting entities supporting Iran’s petroleum sector and other sanctioned activities through the Comprehensive Iran Sanctions, Accountability, and Divestment Act (CISADA), increasing pressure beyond UN measures.
Following UNSC Resolution 1929, the EU adopted a major sanctions framework that went beyond UN measures, targeting areas such as finance, trade, transport, and parts of the energy sector, and expanding listings for asset freezes and travel bans.
The EU adopted legal measures underpinning an embargo on imports of Iranian crude oil and petroleum products, with phase-in provisions for existing contracts—significantly escalating economic pressure on a key revenue source.
The EU’s embargo on Iranian oil imports became operational after the end of wind-down exemptions, amplifying the impact of sanctions on Iran’s oil exports and related shipping/insurance arrangements.
Iran and the P5+1 (E3/EU+3) agreed to an interim arrangement in Geneva: Iran would cap/rollback parts of its nuclear activities and accept enhanced monitoring in exchange for limited, temporary, and reversible sanctions relief while negotiations continued.
After IAEA verification of initial steps under the Joint Plan of Action, the U.S. and partners began implementing specified, time-limited sanctions relief (e.g., certain suspensions and channels for humanitarian-related transactions), while core sanctions architecture remained in place.
Iran and the E3/EU+3 concluded the Joint Comprehensive Plan of Action (JCPOA), setting detailed nuclear restrictions and verification measures in return for phased relief from UN, EU, and U.S. nuclear-related sanctions.
The Security Council unanimously adopted Resolution 2231, endorsing the JCPOA, establishing procedures (including a procurement channel and snapback mechanism), and laying out how and when prior UN Iran nuclear-related sanctions would be terminated upon verified implementation.
On Adoption Day, the JCPOA’s implementation process formally began: Iran started required preparatory nuclear steps and the parties took steps to put in place the legal/administrative groundwork for sanctions lifting on Implementation Day after IAEA verification.
The IAEA released its “Final Assessment on Past and Present Outstanding Issues,” addressing questions related to possible military dimensions (PMD) and providing a key reference point during the JCPOA implementation phase.
After the IAEA verified Iran had implemented required nuclear-related measures, Implementation Day triggered termination/lifting of many nuclear-related sanctions: the EU lifted nuclear-related economic and financial sanctions, and UN sanctions measures were terminated per Resolution 2231 frameworks (with specified continuing restrictions).
International Sanctions on Iran: Escalation, Relief, and Impact (2006–2016)
