FILE - Then U.S. President Richard Nixon and then China's Premier Zhou Enlai join the applause at a gymnastic show in Beijing on Feb. 23, 1972 as they stand in the official box under a capacity crowd with a portrait of Chairman Mao Zedong above. First Lady Pat Nixon is seated on lower right. At the height of the Cold War, U.S. President Richard Nixon flew into communist China's center of power for a visit that over time would transform U.S.-China relations and China's position in the world in ways that were unimaginable at the time. (AP Photo, File)