Since returning to the White House, President Trump has been pushing for talks while increasing sanctions and suggesting a military strike by the U.S.

Iran and the United States began talks in Oman on Saturday aimed at jump-starting negotiations over Tehran's fast-advancing nuclear programme, with U.S. President Donald Trump threatening military action if there is no deal.

Iran's foreign minister has arrived in Oman for talks with the United States over Iran's nuclear programme. Abbas Araghchi told Iranian state television his country wanted a "fair agreement" as delegations from both countries prepare for negotiations.