 Iran chief nuclear negotiator Abbas Raqqai says Iran has begun 60% uranium enrichment a day after Tehran accused Israel of sabotaging a key nuclear site. Raqqai made his announcement shortly before the resumption of talks in Vienna aimed at reviving Tehran's 2015 nuclear deal with major powers. An accord Israel fiercely opposed after former U.S. President Donald Trump abandoned it three years ago. Last week, Iran and the global powers held what they described as constructive talks to salvage the deal, which has unraveled as Iran has breached its limits on sensitive uranium enrichment since Trump reimposed harsh sanctions on Tehran.