The breakdown of negotiations between the U.S. and world powers highlights how difficult it will be for Iran to make a full return as an oil exporter in the near future, according to Barclays Plc. The six-nation negotiating group in Geneva didn’t agree during Nov. 9 talks with Iran on alterations to its nuclear program that would allow financial sanctions to be eased. Even had the talks been more successful, the U.S. Congress has little appetite to lift measures banning imports of Iranian crude and is considered proposals to tighten sanctions further, Miswin Mahesh, a London-based commodities analyst at Barclays, said today in an e-mailed report. “Given the constellation of forces that could stymie a grand bargain, we contend that the path to Iran’s full return to the oil market remains quite perilous,” Mahesh said. The failure of the talks prompted December Brent crude futures to climb 1.2 percent […]