News is that
Iranian Foreign Minister Javad Zarif said on Monday that Tehran would withdraw from the Non-Proliferation Treaty (NPT) if Europeans continued with what he called “their improper behaviour” or referred Iran to the UN Security Council over its alleged violations of the 2015 deal.
Has Iran threatened to leave the NPT before today? (As an aside, North Korea has threatened to leave in 1993 although it didn't do it then, but eventually did in 2003.)