FILE - Then U.S. President Richard Nixon, right, is serious-faced as he eats with chopsticks next to then Chinese Premier Zhou Enlai in Shanghai on February 28, 1972. 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)