Iran has enriched uranium to 60 percent purity, Ali Akbar Salehi, head of the Atomic Energy Organization of Iran, said Friday, according to state-run media.It marks a serious violation of a 2015 nuclear deal with world powers under which Iran's enrichment had been capped to 3.67 percent and quickly brings the purity of its enriched uranium closer to weapons-grade levels.Sixty-percent purity would be the highest level ever achieved under Iran's nuclear program.Iran's move comes as parties to the 2015 nuclear agreement and the United States have started substantive discussions in Vienna with …READ FULL ARTICLE