US President Donald Trump (Photo: Reuters)

US Secretary of State Mike Pompeo will travel to New York on Thursday to notify the UN Security Council that the US is triggering the so-called "snapback" procedure.

"Snapback" is the restoration of all international sanctions against Iran that were lifted as part of the 2015 accord with Tehran that sought to prevent it from developing nuclear weapons.

Restoring the sanctions threatens to paralyze the historic deal that the US, China, Russia, France, Britain, and Germany signed with Tehran in 2015.