The United States issued several nuclear threats against the People's Republic of China in the 1950s to force the evacuation of outlying islands and the cessation of attacks against Quemoy and Matsu, part of Republic of China.[1]Some more reading on the subject of the Korean War, China, and nuclear weapons.
President Truman's relief of General Douglas MacArthur - Wikipedia, the free encyclopedia
This subject deserves a separate thread in the Military History sub-forum.
Edward Friedman, "Nuclear Blackmail and the end of the Korean War," Modern China 1 1 (Jan. 1975), 75-91.
Notice it said United States, not General Douglas MacArthur.
I am well aware of the fact. However the US decision to nuke China came afterwards.