Iran and several world powers held what they described as "constructive" talks on Tuesday and agreed to form working groups to discuss the sanctions Washington might lift and the nuclear curbs Tehran might observe as they try to revive the 2015 nuclear deal.
While longtime foes the United States and Iran say they do not expect any quick breakthroughs, and Tehran has rejected face-to-face talks for now, both governments and the EU described the early exchanges in positive terms.
European intermediaries have started shuttling between Iranian and U.S. officials in Vienna as they seek to bring them back into compliance with the accord, which lifted sanctions on Iran in return for curbs to its nuclear program.