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.

A group of Senate Republicans sent a letter to French, German and U.K. officials this week urging them to immediately reimpose U.N. Security Council sanctions on Iran for the regime’s violations of the 2015 nuclear deal and the Treaty on the Non-Proliferation of Nuclear Weapons.

Six GOP senators, led by Sen. Jim Risch (R-ID), chairman of the Senate Foreign Relations Committee, urged French Foreign Minister Jean-Noël Barrot, German Federal Foreign Minister Johann Wadephul and U.K. Foreign Secretary David Lammy to utilize the snapback provision in UNSC Resolution 2231, which would reimpose all the sanctions lifted on Iran as part of the 2015 deal in response to any violations of the agreement. 

“Initiating the snapback process would be the right — and long overdue — move and would deny Iran the resources it uses for its terror agenda. The 2015 deal flooded Iran with cash while allowing it low-level enrichment, a clock to simply wait out, no limitations on ballistic missiles, and nothing to rein in terror proxies. Years down the line, the sanctions relief Iran received from this deal directly funded Iran’s terror proxies and led to Hamas’ October 7 attack on Israel,” the senators wrote.

“Iran’s ejection of the International Atomic Energy Agency from its facilities marked the latest in a long chain of violations to Iran’s nuclear commitments. These actions confirm what we have known all along: the Iranian nuclear program is not civilian; it is the pursuit of a bomb to destroy Israel and threaten U.S. national security interests in the region. The international community must not tolerate this activity any longer,” they continued. 

The letter was co-signed by Sens. Ted Cruz (R-TX), Pete Ricketts (R-NE), John Cornyn (R-TX), Steve Daines (R-MT) and Bill Hagerty (R-TN).

French Foreign Minister Jean-Noel Barrot warned on Tuesday that the E3, the European countries party to the 2015 Iran nuclear deal known as the Joint Comprehensive Plan of Action, will trigger the snapback mechanism, reimposing all U.N. sanctions, if a new agreement is not reached.

The senators encouraged the recipients of their letter to go beyond simply initiating the snapback sanctions, which takes 30 days and would likely need to be completed before Russia takes over the presidency of the UNSC in October, the same time that the snapback mechanism is set to expire. 

“The decision to initiate the snapback process is only the beginning. The UNSC must fully process and formally re-instate UN sanctions without delay. This will take several weeks, and the October expiration of the snapback mechanism is looming. Furthermore, once sanctions are back in place, we must commit to their enforcement. Chinese purchases of Iranian oil and illicit oil smuggling through third countries have long violated existing U.S. secondary sanctions. Once UN sanctions return, all member countries will have a duty to crack down on this illegal activity,” the group wrote.

“President Trump has instituted a maximum pressure policy to bring Iran to the negotiating table. It is our sincere hope that our allies will stand side by side with America as we counter Iran’s threat to regional and global security for good,” they continued.

France, Germany and the U.K. will bring back sanctions on Iran via the U.N. Security Council if a nuclear deal is not reached by the end of August, French Foreign Minister Jean-Noel Barrot warned on Tuesday.

Barrot said that the E3, the European countries party to the 2015 Iran nuclear deal known as the Joint Comprehensive Plan of Action, will trigger the snapback mechanism, reimposing all U.N. sanctions, if a new agreement is not reached.

The Trump administration hopes to reach an agreement with the Islamic Republic to stop any uranium enrichment in Iran after Israeli and American strikes on Iran’s nuclear sites last month, aiming to prevent Tehran from rebuilding its severely damaged nuclear program.

“France and its partners are …  justified in reapplying global embargoes on arms, banks and nuclear equipment that were lifted 10 years ago,” Barrot said on the way to a meeting with EU foreign ministers in Brussels. “Without a firm, tangible and verifiable commitment from Iran, we will do so by the end of August at the latest.” 

The snapback mechanism expires in October and takes 30 days to activate, such that the end of August is the last chance to impose U.N. sanctions that cannot be vetoed by Russia and China, Iran’s allies on the Security Council. Moscow is slated to assume the presidency of the U.N. Security Council in October and could try to obstruct the move if it is not completed before then.

The E3 reached the shared policy in a phone call with Secretary of State Marco Rubio on Monday, according to Axios. 

Barrot’s statement also came after reports in Arabic and Iranian media that Germany planned to activate snapback sanctions this week, which the German Foreign Ministry denied to Jewish Insider. A German official confirmed that his country shares France’s position.

Earlier this week, Tehran threatened a “proportionate and appropriate response” if the E3 snaps back sanctions, a move Iranian Foreign Ministry Spokesman Esmaeil Baqaei claimed “lacks any legal, political or moral justification.”

“European parties are constantly trying to use it as a tool in violation of their fundamental obligations,” he added.