The problem at the time was the Allied Powers (the Western non-Axis powers and the Soviet Union) were not united about how to resolve the issue of the sovereignty of Korea after the end of World War II. Germany was divided, over in Europe, for much the same reason, but there wasn't an invasion across the line of control between the Soviet occupied zone and the Western occupied zone in Germany, as there was an invasion from North Korea to South Korea in 1950. Perhaps if Stalin's plan had succeeded in Korea, an invasion of western Europe would have followed.