Publishing date: Apr 06, 2021 • 2 hours ago • 2 minute read • Article content VIENNA — Iran and 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. European intermediaries have started shuttling between Iranian and U.S. officials in Vienna as they seek to bring both countries back into compliance with the accord, which lifted sanctions on Iran in return for curbs to its nuclear program. We apologize, but this video has failed to load. Try refreshing your browser, or