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Why Did the European Powers Trigger the Snapback Mechanism Now?

Aug 29, 2025 | Studies & Reports

European Centre for Counter terrorism and Intelligence Studies, Germany & Netherlands – ECCI

European Powers Trigger Mechanism To Snap Back UN Sanctions On Iran

rferl ـ Britain, France, and Germany have triggered the so-called snapback mechanism of the 2015 Iran nuclear deal to reinstate UN sanctions against Tehran.

The European trio, known as the E3, wrote to the UN Security Council on August 28 to initiate the process, which takes 30 days.

In a statement, the E3 foreign ministers said, “We will use the 30-day period to continue engaging with Iran regarding our extension offer or any meaningful diplomatic efforts to restore its compliance with commitments.”

They emphasized that they “share the fundamental objective that Iran must never seek, acquire, or develop a nuclear weapon.”

This step puts Iran at risk of facing renewed sanctions that had been removed as part of the 2015 landmark nuclear accord, formally known as the Joint Comprehensive Plan of Action (JCPOA).

US Secretary of State Marco Rubio welcomed the E3 move.

“At the same time, the United States remains available for direct engagement with Iran — in furtherance of a peaceful, enduring resolution to the Iran nuclear issue,” he said in a statement.

“Snapback does not contradict our earnest readiness for diplomacy, it only enhances it,” he added.

Iran condemned the move.

“This decision by the three European countries will seriously undermine the ongoing process of interaction and cooperation between Iran and the International Atomic Energy Agency (IAEA),” the foreign ministry said in a statement, calling the move a “provocative and unnecessary escalation.”

Once the snapback process is finalized, the already-moribund JCPOA would effectively come to an end.

The deal was designed to stop the Islamic republic from developing a nuclear weapon — something Tehran has long insisted it is not pursuing. It outlines strict rules for independent monitoring of Iran’s nuclear activities and imposes caps on both the amount of uranium it can possess and the level to which it may be enriched.

Iran started to roll back its commitments after the United States withdrew from the deal in 2018 and reimposed sanctions. Iran has progressively accelerated its nuclear program since, now enriching uranium to 60 percent purity — far above the 3.67 percent cap under the JCPOA.

Iran suspended cooperation with the International Atomic Energy Agency in July in response to the US and Israeli bombing of its key nuclear sites in Fordow, Isfahan, and Natanz. One of the conditions that the E3 had set to delay the process was for Tehran to resume full cooperation with the UN nuclear watchdog before the end of August.

European Centre for Counter terrorism and Intelligence Studies, Germany & Netherlands – ECCI

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