World powers negotiators arrive May 23, 2012, at the Baghdad International Airport in Iraq. Negotiators from the U.S. and five other world powers sat down with a team of Iranian diplomats to try to hammer out specific goals in the years-long impasse over Tehran's nuclear program. (Associated Press)

Photo by: Mohammed Ameen

World powers negotiators arrive May 23, 2012, at the Baghdad International Airport in Iraq. Negotiators from the U.S. and five other world powers sat down with a team of Iranian diplomats to try to hammer out specific goals in the years-long impasse over Tehran's nuclear program. (Associated Press)