The latest round of nuclear talks between Iran and six world powers ended on Friday in Vienna, with Iranian and American officials saying that progress was slow and difficult, with serious gaps between the two sides on basic issues like the size of any nuclear enrichment capability Iran would be permitted to retain. A senior American official, speaking on the condition of anonymity to discuss diplomatic negotiations, said that Iran needed to be more realistic in the talks. Iran’s deputy foreign minister, Abbas Araghchi, told Iranian news media that “there was no tangible progress in this round of the talks” and that differences were too large to begin drafting an accord. But he said that the talks would continue next month. The American official agreed with Mr. Araghchi that “significant gaps” remained after three days of talks. “Iran still has to make some hard choices,” the official […]