AP Diplomatic Writer

WASHINGTON — The Biden administration is signaling that Iran shouldn’t expect major new concessions from the United States as a new round of indirect nuclear talks is set to resume.

A senior administration official told reporters Thursday that the U.S. has laid out the concessions it’s prepared to make in order to rejoin the landmark 2015 nuclear deal that former President Donald Trump withdrew from in 2018. The official said success or failure now depends on Iran making the political decision to accept those concessions and to return to compliance with the accord.

The official spoke to reporters in a State Department-organized conference call on the eve of the negotiations’ resumption in Vienna. The official spoke on condition of anonymity to discuss the U.S. position going into the fourth round of closed-door talks at which the remaining participants in the nuclear deal are passing messages between the American and Iranian delegations.

The comments came after Secretary of State Antony Blinken complained of Iranian intransigence in the talks during a visit to Ukraine.

“What we don’t know is whether Iran is actually prepared to make the decisions necessary to return to full compliance with the nuclear agreement,” Blinken said in an interview with NBC News in Kyiv. “They unfortunately have been continuing to take steps that are restarting dangerous parts of their program that the nuclear agreement stopped. And the jury is out on whether they’re prepared to do what’s necessary.”

Iran has thus far given no indication it will settle for anything less than a full lifting of all the Trump sanctions and has balked at suggestions it would have to reverse all of the steps it has taken that violate the deal. Iranian officials have in recent weeks said the U.S. has offered significant, but not sufficient sanctions relief, but they have not outlined exactly what they would do in return.

The administration official said the United States is ready to return to the explicit terms of the nuclear deal, known as the Joint Comprehensive Plan of Action or JCPOA, as they were negotiated by the Obama administration, but only if Iran will do the same.