British foreign minister Liz Truss urged Iran on Wednesday to sign up to the 2015 nuclear deal, saying it was "the last chance" to do, just a day before talks were expected to resume.
"This is really the last chance for Iran to sign up and I strongly urge them to do that because we are determined to work with our allies to prevent Iran securing nuclear weapons," she told the Chatham House think tank.
"So they do need to sign up to the JCPOA (the Joint Comprehensive Plan of Action) agreement, it's in their interests to do so."
The nuclear negotiations between Iran and six world powers resumed this week in Vienna, contrary to the U.S. administrations' initial expectation that the talks would end last weekend.
Israel's Defense Minister Benny Gantz will arrive in Washington Thursday to meet senior American officials, including Secretary of State Antony Blinken and Secretary of Defense Lloyd Austin, as part of Israel's attempt to step up its pressure on American officials.
Israel's does not want to return to the original nuclear deal nor conclude a partial interim agreement. Its goal is rather to intensify sanctions on Iran so that it comes to the next round of negotiations from a significantly weaker position.
Israeli officials are expected to urge Washington to present a military threat on Iran and to demand that any future deal with Iran will be conditioned on the withdrawal of its forces from Syria and other countries in the region, in order to ensure its aerial superiority.