World powers and Iran hold 'constructive' talks on reviving nuclear deal Sorry, but your browser needs Javascript to use this site. If you're not sure how to activate it, please refer to this site: https://www.enable-javascript.com/ Diplomats of the EU, China, Russia and Iran at the start of talks at the Grand Hotel in Vienna on Tuesday | EU DELEGATION IN VIENNA / VIA AFP-JIJI Reuters Apr 7, 2021 VIENNA – 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.