World powers and Iran were locked in talks on reviving their nuclear deal on Friday, with a European source saying they were working from texts discussed five months ago and Iranian officials saying they were sticking to a tough stance from last week.
The talks resumed on Thursday with the United States and Israel - which is not a party to the 2015 deal - piling rhetorical pressure on Tehran about the possible economic or military consequences if diplomacy fails.
Iran's top negotiator, Ali Bagheri Kani, said Tehran was standing firm on the position it laid out last week, when the talks broke off with European and U.S. officials accusing Iran of making new demands and of reneging on compromises worked out earlier this year.