Iran’s Foreign Minister Mohammad Javad Zarif has said he is stepping down, in a surprise announcement posted to his Instagram account.
He apologised for “shortcomings” during his time in government.
Mr Zarif played a prominent role in negotiating the landmark 2015 nuclear agreement between Iran and major international powers.
But the future of the deal has been put into doubt after US President Donald Trump ended US involvement.
Mr Zarif’s resignation was confirmed by Iran’s state-run news agency, IRNA, which cited a spokesman for the foreign ministry.