Iran has tentatively agreed to ship much of its huge stockpile of uranium to Russia if it reaches a broader nuclear deal with the West, according to officials and diplomats involved in the negotiations, potentially a major breakthrough in talks that have until now been deadlocked. Under the proposed agreement, the Russians would convert the uranium into specialized fuel rods for the Bushehr nuclear power plant, Iran’s only commercial reactor. Once the uranium is converted into fuel rods, it is extremely difficult to use them to make a nuclear weapon. That could go a long way toward alleviating Western concerns about Iran’s stockpile, though the agreement would not cut off every pathway that Tehran could take to obtain a nuclear weapon. With a Nov. 24 deadline looming on the nuclear talks, negotiators between Iran and the United States and five other nations are still far from agreement […]