Shortly prior to and during World War II, and coinciding with the Second Sino-Japanese War, tens of thousands of Jewish refugees were resettled in the Japanese Empire. The onset of the European war by Nazi Germany involved the lethal mass persecutions and genocide of Jews, later known as the Holocaust, resulting in thousands of Jewish refugees fleeing east. Most ended up in Japanese-occupied China.

Manchukuo was a puppet state of the Empire of Japan in Northeast China that existed from 1932 until its dissolution in 1945. It was ostensibly founded as a republic, its territory consisting of the lands seized in the Japanese invasion of Manchuria; it was later declared to be a constitutional monarchy in 1934, though very little changed in the actual functioning of government. Manchukuo received limited diplomatic recognition, mostly from states aligned with the Axis powers, with its existence widely seen as illegitimate.