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I agree timshatz. I think it would be a good bet that Stalin would have waited for the approprate time and invaded Eastern Europe. Was Barbarossa about Lebensraum (living room) for the aryan master race or was it a preemptive strike? The nazis eventually blundered the invasion and it seems that Stalin took advantage of the situation and gained much of Europe perhaps taking advantage of his allies. But I believe that in the late thirties and early forties that Stalin knew that his chance for winning a war against Germany in Europe was unlikely.
Furthermore, he lacked the motive for military action in the late thirties/early forties. Like Leninism before it, Stalinism was not much interested in spreading the revolution - rather, it looked inward to plans of internal reconstruction and development. Granted, there was the Khalkin-Gol incident, but that border scuffle was initially conducted through proxy forces, and ultimately settled little in terms of international relations.
I'm not sure about that. Doesn't Marxist theology aim for a world wide worker's revolution? I think the leadership were expecting far more states to follow after 1917 and were rather surprised when it didn't. I also think Stalin was very confident of the abilities of his army, hence the disaster in the Winter War