A raft of UN sanctions on Iran over its nuclear program, lifted under a landmark 2015 deal, will go back into force at the end of Saturday — barring a diplomatic breakthrough, thought to be unlikely.

The sanctions will be reimposed because the “E3” European group — Britain, France and Germany — triggered a mechanism in the deal alleging Tehran was not meeting its obligations.

Here are some key facts about the so-called “snapback” process:

– What do the sanctions target? –

The sanctions target companies, organizations and individuals that contribute directly or indirectly to Iran’s nuclear program or the development of its ballistic missiles.

Providing necessary equipment, expertise, or funding are all grounds for sanctions.

– Swath of the economy affected –

The sanctions that will b

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