The United States has indicated it is ready to return to talks on the Iran nuclear deal after reversing a move by former president Donald Trump to reimpose all sanctions.
In an announcement late on Thursday night the State Department also said it was easing travel restrictions on Iranian diplomats posted to the United Nations in New York.
The moves came ahead of meetings of the G7 group of industrialised countries and the annual Munich Security Conference on Friday.
President Joe Biden is expected to speak at both.
The US had declared last September that all United Nations sanctions were restored because of Iran’s “significant non-performance” of its obligations under the 2015 deal, known as the Joint Comprehensive Plan of Action (JCPOA).
The legality of that declaration was questioned at the time by Britain, France and Germany.
But in a letter to the UN Security Council on Thursday, the acting US ambassador Richard Mills said his country “hereby withdraws” the three letters sent by the Trump administration.
The US also said it would accept an invitation from the EU’s foreign policy chief Josep Borrell to discuss the Iran nuclear deal at a meeting of its participants.
In Iran, state television quoted President Hassan Rouhani earlier on Thursday as expressing hope that the Biden administration will rejoin the accord and lift the US sanctions that Washington re-imposed under Trump.
The 2015 deal was signed by the five permanent members of the UN Security Council and Germany, known as the P5+1, along with Iran.
State Department spokesman Ned Price said on Thursday: “The United States would accept an invitation from the European Union High Representative to attend a meeting of the P5+1 and Iran to discuss a diplomatic way forward on Iran’s nuclear programme.”