Explainer: The U.S. triggered a 'snapback' of U.N. sanctions on Iran, what does that mean?

FILE PHOTO: The United Nations Headquarters is pictured in New York City, New York, U.S., March 10, 2020. REUTERS/Carlo Allegri/File Photo

NEW YORK (Reuters) - U.S. President Donald Trump's administration on Thursday triggered a process aimed at restoring all U.N. sanctions on Iran after the U.N. Security Council rejected a U.S. bid to extend a conventional arms embargo on the country.

Here is a look at the events leading to this showdown and an explanation of what could happen next.