UK, France, and Germany Threaten to ‘Snap Back’ UN Sanctions on Iran if Nuclear Talks Stall

In a dramatic diplomatic warning, France, Germany, and the United Kingdom have signaled they are ready to reimpose United Nations sanctions on Iran if it fails to resume negotiations over its nuclear program, the Financial Times reported Tuesday.

According to the newspaper, the foreign ministers of the so-called E3 wrote to the UN, raising the prospect of triggering the “snapback” sanctions mechanism unless Tehran takes “meaningful steps” toward a diplomatic settlement.

“We have made it clear that if Iran is not willing to reach a diplomatic solution before the end of August 2025, or does not seize the opportunity of an extension, the E3 are prepared to trigger the snapback mechanism,” the ministers wrote, per the FT.

The warning follows what the ministers described as “serious, frank, and detailed” talks with Iranian officials in Istanbul last month, their first face-to-face meeting since Israeli and US strikes targeted Iran’s nuclear facilities.

Requests for comment from the UK, French, and German governments went unanswered.

The snapback mechanism, established under the 2015 Iran nuclear deal (Joint Comprehensive Plan of Action), enables the automatic reimposition of UN sanctions if Iran is deemed in significant breach of its commitments, bypassing the need for a new Security Council vote.