Iranian Deputy Foreign Minister Majid Ravanchi on Tuesday signaled progress in Tehran’s nuclear talks with six world powers as the latest round of negotiations started in the Austrian capital. In an interview with The Wall Street Journal before the talks, Mr. Ravanchi said Iran would address “legitimate concerns” about Iran’s heavy-water plutonium reactor in Arak, which the West says could produce enough plutonium for a nuclear weapon. “We have not reached a conclusion on Arak, but at least we know very well where they are and where we are and how the positions of the two sides can merge,” he said. Iran pledged in November’s interim nuclear accord to stop major work on the reactor, whose spent fuel would contain plutonium. The United Nations atomic agency, which oversees the accord, has said Tehran is complying. But Western countries remain concerned about Arak, which Iran says is intended to produce […]