Iranian President Hassan Rouhani waves after speaking at a press conference in Tehran in June. Associated Press It’s crunch time with Iran. Negotiators from the U.S. and five other international powers have until Sunday to reach a long-term deal with Iran on reducing its nuclear program, declare the negotiations a failure, or make the politically awkward decision to extend their self-imposed deadline for a deal. U.S. officials don’t want to talk about extending the deadline—that would just reduce pressure to get an agreement—though an extension seems the likeliest outcome as a bevy of high-level negotiators wrestle in marathon talks in Vienna. The mood of the talks has gone from optimistic weeks ago, as Iran made concessions on items such as the future of its Arak nuclear reactor, to pessimistic in recent days as it becomes clear a giant gap remains on the crucial question of how much capacity Iran […]