The American public would never have accepted the huge losses of men in such a scenario. Also the strategic capabilities of the allies wouldn't have had any effect in a short term, the reds would already be doing a "Dunkirk Part deux" before any effects of strategic bombing would have had any effect. The Russians had a clear tactical superiority and that would've forced the allied high altitude fighters to fight at a serious disadvantage, P-51 vs La-7 at 1-3000 meters altitude, bye bye little pony.
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