Iran says its nuclear program is peaceful but officials are threatening to pursue a nuclear weapon. Photo: AP PHOTO

United Nations sanctions on Iran over its nuclear program have been reimposed.

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Here's what to know about Iran's nuclear sites, "snapback" sanctions and other issues raising tensions between Iran and the West:

WHAT IS 'SNAPBACK' AND HOW DOES IT WORK?

The "snapback" process, as it is called by the diplomats who negotiated it into Iran's 2015 nuclear deal with world powers, is designed to be veto-proof at the UN Security Council and took effect 30 days after parties to

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