U.S. Army Gen. Martin E. Dempsey (left), chairman of the Joint Chiefs of Staff, shakes hands with his Chinese counterpart, Gen. Fang Fenghui, who is chairman of the General Staff, during their press briefing at the Bayi Building in Beijing on Monday, April 22, 2013. Gen. Fang said Beijing firmly opposes the North's nuclear weapons program and wants to work with others on negotiations to end it. (AP Photo/Andy Wong, Pool)

Photo by: Andy Wong

U.S. Army Gen. Martin E. Dempsey (left), chairman of the Joint Chiefs of Staff, shakes hands with his Chinese counterpart, Gen. Fang Fenghui, who is chairman of the General Staff, during their press briefing at the Bayi Building in Beijing on Monday, April 22, 2013. Gen. Fang said Beijing firmly opposes the North's nuclear weapons program and wants to work with others on negotiations to end it. (AP Photo/Andy Wong, Pool)