U.S. Secretary of State John F. Kerry gestures during a joint a news conference with Jordanian Foreign Minister Nasser Judeh in Amman, Jordan, on Wednesday, May 22, 2013. (AP Photo/Jim Young, Pool)
** FILE ** U.S. Secretary of State John F. Kerry speaks during a meet-and-greet with European Commission fellows hosted by commission President Jose Manuel Barroso on Monday, April 22, 2013, in Brussels. (AP Photo/Evan Vucci, Pool)
U.S. Secretary of State John F. Kerry (right) and Turkish Foreign Minister Ahmet Davutoglu point toward the Bosporus before a working lunch in Istanbul on Sunday, April 21, 2013. (AP Photo/Hakan Goktepe, Pool)
U.S. Secretary of State John F. Kerry speaks to students at the Tokyo Institute of Technology in Tokyo on Monday, April 15, 2013. (AP Photo/Junji Kurokawa, Pool)
Secretary of State John F. Kerry is on his first trip to Asia as the top U.S. diplomat, just as North Korea increases its nuclear threats and may be preparing for a missile test. (Associated Press)
U.S. Secretary of State John F. Kerry is pictured before a meeting at the Foreign and Commonwealth Office in central London on Wednesday, April 10, 2013. (AP Photo/Ben Stansall, Pool)
Turkish Prime Minister Recep Tayyip Erdogan (right) and U.S. Secretary of State John F. Kerry shake hands before a meeting in Istanbul on Sunday, April 7, 2013. Mr. Kerry will coordinate with Mr. Erdogan and other Turkish officials on efforts to halt the violence in neighboring Syria's civil war. (AP Photo/Kayhan Ozer, Turkish Prime Minister's Press Office)
** FILE ** U.S. Secretary of State John F. Kerry (left) shakes hands with U.S. Marines based in Baghdad during his visit to the U.S. Embassy in the Iraqi capital on Monday, March 25, 2013. (AP Photo/Jason Reed, Pool)
U.S. Secretary of State John F. Kerry (left) walks to a meeting with Afghan President Hamid Karzai (center) at the Presidential Palace in Kabul, Afghanistan, on Monday, March 25, 2013. (AP Photo/Jason Reed, Pool)