(CNN) — France, Germany and the United Kingdom have begun the process to reimpose UN sanctions on Iran over its nuclear program.

The triggering of the snapback sanctions comes as diplomatic efforts to restrain Iran’s growing nuclear program have faltered. Tehran has warned there could be consequences for the move.

The “E3” countries notified the UN Security Council Thursday that they were triggering the snapback mechanism, which was included as part of the 2015 Iran nuclear deal.

Iran has increasingly breached the nuclear deal after President Donald Trump withdrew the US from the agreement, called the Joint Comprehensive Plan of Action (JCPoA), in 2018.

“Today, Iran’s non-compliance with the JCPoA is clear and deliberate, and sites of major proliferation concern in Iran are outside

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