Let’s look at Taiwan. All military attacks against Taiwan during the World War II period were conducted by the United States, so the U.S. is the “conqueror.” The surrender of the Japanese military forces in Formosa was on Oct. 25, 1945, thus beginning the military occupation, and the administrative authority for this military occupation was delegated to Chiang Kai-shek (aka the Chinese nationalists or Republic of China). The treaty between the U.S. and Japan came into effect on April 28, 1952. Japan renounced the territorial sovereignty of Taiwan, but no receiving country was named. The Republic of China flag should have come down at this point.
While the KMT (Chinese Nationalist) “white terror” in Taiwan was nothing compared to the CCP (Chinese Communist) “red terror” in China, it is a mistake to think that either were popular parties in their respective countries.