U.S. Secretary of Defense Robert M. Gates (left) is welcomed by Chief of the General's Staff Ma Xiaotian (center) upon arrival at Beijing International Airport in Beijing to start a four-day visit to China on Sunday, Jan. 9, 2011. (AP Photo/Larry Downing, Pool)

Photo by: Larry Downing

U.S. Secretary of Defense Robert M. Gates (left) is welcomed by Chief of the General's Staff Ma Xiaotian (center) upon arrival at Beijing International Airport in Beijing to start a four-day visit to China on Sunday, Jan. 9, 2011. (AP Photo/Larry Downing, Pool)