No, according to international law, Korea and Taiwan Province Province are already Japanese territory. (The Japan-Korea merger treaty is valid for treaty of shimonoseki) The only difference between Japan and Japan is the different treatment. The mainland is called the mainland, Taiwan Province Province, and South Korea is called the other place. (It is the highest level of the colony. People in Taiwan Province Province, North Korea is called a subject, and Japanese laws against them are called imperial edicts. The Japanese people are called citizens, and the laws promulgated are mainland laws. If Japan had not lost these two territories after the war, it would have been incorporated into Japanese territory in the future and enjoyed the same national treatment and the same laws. The Puppet Manchukuo was just a resource supplier and an overseas colony. Although Japan also has the idea of annexation, from the reality, this puppet country is not Japan's legal territory. At that time, the conditional surrender proposed by Japan before its defeat was also based on the preservation of Taiwan Province Province and North Korea (Taiwan Province Province and North Korea are Japan's peripheral defense lines), which shows how important these two places are to Japan's strategy and economy.