Mao Zedong thanking Japan controversy
Mao Zedong, the longtime Chairman of the Chinese Communist Party and the founder of the People's Republic of China, repeatedly thanked Japanese military and political figures who visited China in the 1950s and 1970s. Mao said that the Japanese invasion of China had united Chinese people and allowed the Chinese Communist Party to win the Chinese Civil War.
Source: Wikipedia — Mao Zedong thanking Japan controversy (CC BY-SA 4.0)