As Britain, should I declare war on both Germany and the Soviet Union? I’m thinking to guarantee Finland and destroy Communism AND Fascism
It gets quite a lot atm and allies are only in EUrope that is why Germany looses so badly atm. Also the Italian army being entirely in Ethopia doesnt help the atlantic Wall.If you go that route, the war with Soviets will be a phoney war until you beat the Germans anyway. If you call in India you'll get a small front in the Himalayas, which will likely get completely bogged down due to mountains and low infra. I guess you could send forces to defend Finland, but usually you are already spread very thin in 1940, so it's not really realistic. The USSR might get less lend-lease. In vanilla singleplayer, I doubt it makes a significant difference.
TLDR: It will not change anything.