France, Germany and the U.K. are poised to reinstate snapback sanctions on Iran in the next several days, after talks held in Geneva this week aimed at scaling back Iran’s nuclear program reportedly concluded with little progress.

The three countries — known as the E3 — sent a letter to the U.N. Security Council earlier this month outlining “ongoing concerns regarding the lack of assurances as to the exclusively peaceful nature of Iran’s nuclear program” and Tehran’s ongoing violations of the 2015 Joint Comprehensive Plan of Action, to which the E3 countries are still parties despite the U.S. withdrawal in 2018. 

The countries threatened to reinstate snapback sanctions by the end of August 2025 if “no satisfactory resolution” to the issue was reached before then. 

The mechanism to trigger snapback sanctions at the UNSC expires in October, at which point any attempt to adopt new UNSC sanctions could face vetoes from Russia and China. However, the E3 and U.S. are looking to start the process before Russia assumes the UNSC presidency in October, giving it the power to delay the imposition of snapback sanctions — a process that takes 30 days to complete — until its expiration date. 

The foreign ministers of the E3 and Iran met in Geneva earlier this week to discuss a diplomatic solution that would see Iran roll back its nuclear program without additional sanctions, which reportedly ended with little progress made.

A senior European diplomat told Axios on Wednesday that it would take a “diplomatic miracle” to prevent the reinstatement of snapback sanctions, with the European nations poised to trigger the mechanism as soon as Thursday.

Secretary of State Marco Rubio held a call with the E3 foreign ministers on Wednesday, during which all of the officials “reiterated their commitment to ensuring that Iran never develops or obtains a nuclear weapon,” State Department Principal Deputy Spokesperson Tommy Pigott said.

U.S. lawmakers have repeatedly pressed for the E3 to trigger the snapback mechanism.