U.S. briefed on nuclear working group meetings with Iran in Vienna

(Reuters) - Diplomats from major powers and the European Union met separately on Wednesday with Iran and the United States to discuss what sanctions Washington might remove and what nuclear curbs Tehran might observe in an effort to bring both back into compliance with the 2015 nuclear deal, a U.S. official said.

Longtime foes the United States and Iran have said they do not expect quick breakthroughs in the talks that began in Vienna on Tuesday, with European and other diplomats as intermediaries because Tehran rejects face-to-face talks for now.