Nuclear negotiations between Iran and six major powers hit a fresh hurdle this week when the country’s Supreme Leader said Iran needs significantly greater enrichment capacity. Ayatollah Ali Khamenei’s comment in a speech Monday to senior level technocrats and military personnel came as negotiators in Vienna struggle to complete a final nuclear agreement by the July 20 deadline. Western diplomats have said progress in the talks has been very slow. The negotiations aim to win commitments from Iran to limit its future nuclear program in exchange for a gradual end to international sanctions. Western officials have said an Iranian insistence on a bigger program would be a deal-breaker. A U.S. official said on Tuesday that negotiators for the six powers—China, France, Germany, Russia, the U.K., and the U.S.—focus on what Iran’s diplomats say at the negotiating table. But the comments by Mr. Khamenei, considered the final arbiter of Iran’s […]