Iran reached a landmark nuclear agreement with the U.S. and five other world powers, a long-sought foreign policy goal of the Obama administration that sets the White House on course for months of political strife with dissenters in Congress and in allied Middle Eastern nations. The accord, which was expected to be signed off at a meeting at 10:30 a.m. local time in Vienna, after a decade of diplomatic efforts that frequently appeared on the verge of collapse, aims to prevent Iran from producing nuclear weapons in exchange for sanctions relief. A press conference will follow, a spokeswoman for European Union foreign policy chief Federica Mogherini said. Assessments of the pact’s likely effect are a source of argument. The Obama administration and its partners hope the deal will resolve a dispute that at times threatened to spark a military conflict. In the optimistic view, it would ease tensions with […]