The United Nations Security Council on Saturday evening reimposed broad sanctions and restrictions on Iran, after determining that Tehran had engaged in “significant non-performance” of its nuclear obligations.

The sanctions were restored under the snapback provision of UN Security Council Resolution 2231 , which endorsed the 2015 Joint Comprehensive Plan of Action (JCPOA) . That mechanism allowed for the automatic reimposition of earlier sanctions if Iran was found to be in noncompliance, and it was deliberately structured to prevent a veto by permanent Council members. Under the terms of the resolution, once a JCPOA participant notified the Council of violations, the suspended measures would resume after 30 days unless the Council voted to extend relief.

The decision followed a

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