Collaboration with the Empire of Japan

Before and during World War II, the Empire of Japan created a number of puppet states that played a noticeable role in the war by collaborating with Imperial Japan. With promises of "Asia for the Asiatics" cooperating in a Greater East Asia Co-Prosperity Sphere, Japan also sponsored or collaborated with parts of nationalist movements in several Asian countries colonised by European empires, the Soviet Union, and the United States.

Source: Wikipedia — Collaboration with the Empire of Japan (CC BY-SA 4.0)