Buddy, I'm not going to defend the actions of Western powers during the build up to World War II. I agree with you that an antifascist alliance should have been formed and could have stopped Hitler much sooner and with much less death.
I do find it interesting that the article you provided makes no mention of Soviet annexation (Imperialism? Colonization? Liberation? Let me know which hyperspecific term for invading another country I should use) of the pre-Brest-Litovsk territory they lost.

Once and for all