Stalin's invasion of Finland which RusIvan called "preparations for world war" also show that Stalin had every intention of pursuing war against the west even before he was ever attacked by Hitler.==
Finland is one of the nation which collaborated with bolshevicks in 1920th. (Another example: baltic nations.)
Finns could grab in 1920th Karella Ismus (I hope I prononce right) and town Vyborg. This territory wasn't finnish. Bolshevicks gave it to them in 1920th as trade-off because they seeked the finish support for bolshevick power.
In 1940 Stlin decided to took given back to mov eborder west from town Peterburg. Finns refused then war began.
West is Germany, France, Italy, Britain, Spain.
Others are EAST. The bunch of countries which interacted with Russian Empire later Soviet Union.
IMO you consider those countries of eastern Europe as innocents.
But they don't. They collaborated in bolshevick revolt in 1917. Thier ethnic members participated in bolshevick party and even more numerious in Civil War 1917-22 against russian White Movement.
What they got later from hands of Stalin was well earned in 1920.