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Spun-off from an idea on another thread here. The US/UK knew they needed the USSR to defeat Germany but they also knew pretty early on in their alliance that the USSR and Stalin was only so trustworthy and that he'd have his own post-war ambitions.
Could it have been possible for them to attempt to sabotage the USSR or hold off support just enough whereby they could still use the USSR's manpower to win the war but have them utterly weak at the end and dependent on the American/Brits immediate post-war.