Trump administration to trigger ‘snapback’ of UN sanctions on Iran: What does it mean? - Fox News

The mechanism known as "snapback" was negotiated and included in U.N. Security Council Resolution 2231, which allows for sanctions and other restrictions to be immediately re-imposed on Iran if it was seen to be breaking the compact. https://www.foxnews.com/politics/trump-administration-to-trigger-snapback-of-un-sanctions-on-iran-what-does-it-mean