Representatives of the United States will be on hand but will not meet directly with the Iranians when the remaining Iran nuclear deal signatories meet next week, officials said Friday.

“One of the parties is telling … that they, for the time being, prefer not to meet directly with the other party,” a senior EU official involved in the talks said, referring discreetly to the Iranians, who have insisted that the U.S. should end all unilateral sanctions as a precondition to renewed negotiations.

Tuesday’s meeting in Vienna is part of a renewed push to bring the U.S. back into the accord following the country’s withdrawal under then-President Donald Trump.