How do you think WWII would had run if France and UK had declared war on the Soviets after their invasion of Poland?
If you think that implausible, then have the Entente execute Operation Pike
When would the Moscow-Berlin Axis of Evil go to war against one another?
Possible only if our leader,Rydz-Śmigły do not ordered our army to not fight soviets and run.Considering how shitty soviet army was,we would fight them till we have ammo - some 2-3 months.
Them Allies must declare war on soviets.
No attack on Finland/soviets would fight Poland/ ,but after fall of France soviets would attack Turkey,Iraq and Iran.I think,that when german send Rommel to Libya,attack from both sides would break british there and in 1941 they would hold only part of Iran and Sudan.
Now,Pearl Harbour just like OTL,Hitler declare war on USA just like OTL - but Stalin not.He wait till 1944,backstab his ally, take entire Europe - and USA made deal with him just like in OTL.England do not matter anymore,just like OTL,too.
Thanks to taking Europe,soviets overrun more of Africa and Asia.Soviet India,maybe ? But they go bancrupt just like in OTL.Only difference - communism would genocide 400-800 millions instead of 100-200.