To be fair, Germany absolutely demolished Russia in WWI with reserve troops sent as a distraction while they were in a stalemate with the vast majority of their actual troops against the entire West.
Now fast forward 20 years. You've literally rolled over those froggy fucks and have cucked Britain so hard they need a constant flow of American goods to avoid starving to death. Surely Russia, the enemy who got stomped by a bunch of reserves, won't put up a fight if France, the enemy who was so much stronger, was easily defeated. Russia is impoverished, uneducated, and corrupt. Stalin purged all the intellectuals and competent military officers in order to seal his command. Untold millions of citizens of Soviet satellite states hate the communist union and would welcome fascism with open arms. Hell, Finnland managed to stave off damn near the entire Russian army with a handful of conscripts during WWII. Can you really blame Hitler for backstabbing Stalin?
Hilariously, the uneducated masses of the main Soviet regime were too stupid and cowed in fear to realize a better life existed, and so fought to the death regardless of circumstances. Ultimately, it would be the logistics of the Eastern front that would undo the Wehrmacht, since the Germans relied on actual modern roads and rails to maintain their supply lines, and even though they knew every road and railway in Russia, all they got were shitty dirt paths instead of actual paved streets. When the rains arrived and the roads turned to quicksand mud, it became impossible to advance, much less hold any obtained ground.
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