Sanctions Snap-Back

A mechanism that automatically restores previously lifted sanctions when a party breaches a deal, without a fresh vote that could be vetoed. The defining example is UNSC Resolution 2231 (2015), which endorsed the Iran nuclear deal (JCPOA) and built in a process for any participant to trigger reimposition of the pre-2231 UN sanctions if Iran failed to perform. The snap-back returns the prior resolutions to force, including the arms restrictions and asset freezes they carried.