Manchukuo
Manchuria was the place of the Manchus, including the kings of the Qing dynasty. In 1931, Japan occupied Manchuria after the Mukden Incident.  A pro-Japanese government was created one year later with Puyi, the last Qing emperor, as the nominal regent and later emperor. Manchukuo's government was removed in 1945 at the end of World War II. The Soviet Union invaded in August 1945, and formally transferred the territory to Chinese administration in the following year.