Iran, once OPEC’s second-largest oil producer, will be unable to sustain an increase in crude exports that support its economy when some measures to curb those shipments are eased, the International Energy Agency said. The European Union said last month that it intends to suspend a ban on insuring tankers carrying the Iranian oil from December or January. The U.S. said it will stop forcing buyers to cut purchases, even if they still aren’t allowed to increase them. The concessions are in return for commitments from the Persian Gulf state to provide more information on its nuclear program, which western powers claim is intended to make weapons. Neither the EU nor the U.S. lifted sanctions on importing the nation’s oil. “The fact that the oil sanctions remain fully in place leaves on the face of it no room for any sustained increase in exports,” the IEA, a Paris-based adviser […]