Manchukuo size comparison
1,192,081 km2 / 460,143 mile2
Manchukuo, officially the State of Manchuria prior to 1934 and the Empire of Manchuria after 1934, was a puppet state of the Empire of Japan in Northeast China and Inner Mongolia from 1932 until 1945. It was founded in 1932 after the Japanese invasion of Manchuria, and in 1934 it became a constitutional monarchy. Under the de facto control of Japan, it had limited international recognition.