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If the Yalta conference is a failure and disagreement over the future of Europe bog down the conference with part of the fallout leading to the Soviets not declaring war on Japan (amongst other things) what would the outcome be if the Soviets declare war on the allies while they are engaged in operation downfall, invading Japan because of nukes being delayed a number of years? (Post bump edit, start time any time between 1945 and 1953)
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