Article Photos: Obama's return a test of evolving foreign policy 2/4

  FILE - In this Saturday, Feb. 3, 2007 file photo, an Iranian technician works at the Uranium Conversion Facility just outside the city of Isfahan 255 miles (410 kilometers) south of the capital Tehran, Iran. The phrases to describe some of the looming foreign policy challenges for U.S. President Barack Obama didn't even exist when he took the oath of office the first time: the Arab Spring, the Fordo Facility housing Iran's underground uranium enrichment labs, the stealth power of new viruses bearing names such as Stuxnet and Flame in the shadow world of cyber-sabotage. But that also doesn't mean the list of earlier conflicts, stalemates and crises _ inherited by Obama in his first term and, in some cases, reaching back decades _ is any shorter for the White House. Obama has stood by the policy that tightening sanctions and diplomacy is the best course to leverage possible concessions from Iran on its nuclear program, which the West and others fear could eventually lead to atomic weapons. Iran says it only seeks reactors for energy and medical research.(AP Photo/Vahid Salemi, File)