UN Snapback Mechanism Reimposed Pre-2015 Sanctions on Iran

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The UN snapback mechanism concluded, reimposing all pre-2015 UN sanctions on Iran after the E3 nations (France, Germany, United Kingdom) initiated the process in August 2025, citing Iran’s deliberate failure to meet JCPOA commitments since 2019. A Russian/Chinese resolution to extend the October 18 deadline until April 2026 was rejected. Iran subsequently announced termination of the JCPOA on October 18, 2025, claiming Resolution 2231 “ceased to have any legal effect.” The restoration of multilateral sanctions represented the final collapse of the 2015 nuclear deal.

Sources & Citations

[1] Iran snapback nuclear sanctions Tier 1

[2] Iran sanctions snapback - Council reimposes restrictive measures Tier 1

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The Cascade Ledger. “UN Snapback Mechanism Reimposed Pre-2015 Sanctions on Iran.” The Capture Cascade Timeline, September 27, 2025. https://capturecascade.org/event/2025-09-27--un-snapback-sanctions-reimposed-on-iran/