The EU3 has told the UN it is ready to reinstate sanctions against Iran.

Britain , Germany , and France have sent a letter to the UN stating that they are prepared to initiate the return of sanctions against Iran if Tehran does not resume negotiations over its nuclear program, the Financial Times reports.

A letter addressed to UN Secretary-General António Guterres was signed by the foreign ministers of the EU3 countries: Jean-Noël Barrot of France, Johann Wadephul of Germany, and David Lammy of the United Kingdom . The document states that Berlin , Paris, and London have proposed that Tehran extend the suspension of sanctions to avoid their automatic reinstatement later this month.

"We have made it clear that if Iran fails to reach a diplomatic solution by the end of August 2025 or does not exercise the extension option, the E3 is prepared to initiate the snapback mechanism," the FT quotes the ministers' letter.

The EU3 threatened Iran with renewed sanctions in mid-July following Tehran's suspension of cooperation with the International Atomic Energy Agency (IAEA) following Israeli and US strikes in June. Iran then agreed to resume nuclear talks with Britain, Germany, and France, which took place in Turkey in late July.

During this meeting, representatives of the EU3 announced that they were prepared to extend the suspension of sanctions, which would otherwise come back into force at the end of August, if Tehran agreed to resume nuclear negotiations with the US and cooperation with the IAEA by September.

One Western diplomat described the negotiations as "difficult." On Tuesday, EU3 representatives stated that their proposal "remained unanswered by Iran." Iranian Foreign Minister Abbas Araghchi told the FT after the meeting that the two countries had "no legal or moral basis" for reimposing sanctions, and warned that Iran would exclude European powers from future nuclear negotiations if they continued.

Araghchi accused the EU3 of failing to fulfill its obligations under the nuclear deal and said the sanctions rollback mechanism was "no longer so important." "There's no point in negotiating with the Europeans now, because they can't lift the sanctions ; they can't do anything," he said. "If they take retaliatory measures, it means the end of the road for them."

The foreign ministers of Britain, Germany and France stressed in a letter to the UN that they have "clear and unambiguous" legal grounds for reimposing sanctions on Iran, as Tehran has "deliberately" retreated from its obligations under the deal since 2019.

On October 18, UN Security Council sanctions against Iran expire. They were lifted under the 2015 nuclear deal between Britain, France, Germany, the United States, CHINA , and RUSSIA. In exchange for the lifting of international sanctions, Tehran agreed to limit its nuclear program, excluding the development of nuclear weapons. The United States withdrew from the treaty in 2018, and a year later, Iran announced it was suspending its obligations under the agreement.

If even one of the remaining parties to the deal triggers the snapback mechanism, international sanctions could be reinstated. Russia opposed the snapback mechanism.

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