The Globe and Mail Francois Murphy, Parisa Hafezi and John Irish VIENNA Bookmark Please log in to listen to this story. Also available in French and Mandarin. Log In Create Free Account Getting audio file ... This translation has been automatically generated and has not been verified for accuracy. Full Disclaimer Handout/Getty Images Iran and global powers resumed talks on Thursday to rescue the 2015 nuclear deal in an effort potentially complicated by Tehran’s decision to ramp up uranium enrichment and what it called Israeli sabotage at a nuclear site. Casting a shadow over the Vienna talks, Tehran on Tuesday announced its decision to enrich uranium at 60 per cent purity, a big step closer to the 90 per cent that is weapons-grade material, in response to an explosion at its key Natanz facility on Sunday.