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IOTL 400,000 japanese were removed from the Karafuto prefecture in Sakhalin after WW2.
If for some reason, the war ends with the Soviets occupying Northern Japan in addition to Manchuria and North Korea, would they still relocate these people? Or would some of Sakhalin be included in a Soviet puppet Japan?
In other words, would a soviet puppet state in the Japanese home islands include any of Sakhalin, or would Karafuto be treated like East Prussia?