[1] https://en.wikipedia.org/wiki/Soviet_invasion_of_Poland
[2] https://en.wikipedia.org/wiki/Occupation_of_the_Baltic_state...
[3] https://en.wikipedia.org/wiki/German%E2%80%93Soviet_Credit_A...
Which country wasn't trading with Nazi Germany?
Bolsheviks were terrorists [7], the state evolved from terrorists organisation. It should be shamed just as we shame Fascists. Meanwhile in Russia Stalin popularity is record high [8].
[1] https://en.wikipedia.org/wiki/Gulag
[2] https://en.wikipedia.org/wiki/Great_Purge
[3] https://en.wikipedia.org/wiki/Soviet_famine_of_1932%E2%80%93...
[4] https://en.wikipedia.org/wiki/Passport_system_in_the_Soviet_...
[5] https://en.wikipedia.org/wiki/World_revolution
[6] https://en.wikipedia.org/wiki/Soviet_Empire
All that the parent comment listed doesn't have anything to do with that.
The fact is that the USSR and Germany signed a non-aggression pact, not a treaty of alliance. You can read the text [0] yourself and see that there is nothing resembling a war alliance.
[0] https://en.wikisource.org/wiki/Molotov%E2%80%93Ribbentrop_Pa...
https://en.wikisource.org/wiki/Molotov%E2%80%93Ribbentrop_Pa...
They even divided Poland in a coordinated attack on two fronts.
https://en.wikipedia.org/wiki/German%E2%80%93Soviet_military...
It is not the name that matters but content and actions.
[1] https://en.wikipedia.org/wiki/Polish%E2%80%93Czechoslovak_bo...
[2] https://en.wikipedia.org/wiki/Polish%E2%80%93Ukrainian_War
[3] https://en.wikipedia.org/wiki/Treaty_of_Versailles
[4] https://en.wikipedia.org/wiki/German%E2%80%93Soviet_Border_a...
That's false. Russia and Germany had a non-aggression pact. Also you should read about the Munich Agreement[0], that preceded the Molotov-Ribbentrop pact and clearly shown that no one was willing to fight Germany and protect Czechoslovakia besides the USSR.
[0] https://en.wikipedia.org/wiki/Munich_Agreement