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Stalin thinking the Allies are weak and thinks now would be a good enough time as any orders his massive armies to attacks the Allie forces after the German surrender in 1945.
So if Stalin order his huge army fronts to push the Americans and British into the sea. How far do you think they would get? Would they push the Allies all the way back to England? Soviet military production not as great as Britain and America but they don't need to ship everything across the Atlantic ocean either.
In 1945 the soviets have some of the best tanks: IS3 and ISU 152 sp guns
In 1945 the soviets have a large air fore but no heavy bombers
American have some Pershing heavy tanks, but would have to fight mostly with the crappy M4 Sherman.
British best tank at the time is the crappy Comet 1 and Cromwell.
The Allies do have their huge heavy bomber fleets. So what do you think the outcome would be? Plus remember the Allies are still fight the Japanese at the time.