US Under Secretary for Political Affairs Wendy Sherman, center, waits for the start of the two days of closed-door nuclear talks on Tuesday, Oct. 15, 2013 at the United Nations offices in Geneva, Switzerland. Iran’s overtures to the West are being tested as the U.S. and its partners sit down for the first talks on Tehran’s nuclear program since the election of a reformist Iranian president. Negotiations between Iran and the U.S., Russia, China, Britain, France and Germany began Tuesday morning. (AP Photo/Fabrice Coffrini, pool)