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What if Stalin would have, for whatever reason, actually took the pre-Barbarossa warnings of an impending Nazi German invasion of the Soviet Union seriously and thus tried implementing whatever precautionary measures he could as fast as possible just in case these warnings of a pending invasion turned out to be accurate? How much less successful would Operation Barbarossa have been in such a scenario? (In real life, the Nazi German advance in 1941 stopped very close to Moscow; where exactly would the Nazi German advance in 1941 have stopped in this scenario?) In addition, how quicker would World War II have ended on the Eastern Front in this scenario, and how much less casualties and specifically deaths would the Soviet Union have endured during World War II in this scenario?

Any thoughts on this?

Also, Yes, if this isn't already clear enough here, Stalin still purges the Red Army in the 1930s in this scenario as much as he did in real life.
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