Originally Posted by
GeeRam
USSR were not part of the Axis Powers, and didn't change sides as such.
The Molotov-Ribbentrop Pact was a non-aggression pact between the Reich and USSR that enabled them to partition Poland between them, it didn't mean USSR signed up to the Axis Powers.
Of course the reasons Hitler justified invading Poland are now the exact same reasons Pootin has justified invading Ukraine......
I think a quick check of the accepted history would show that after Russia / Soviets signed the Molotov-Ribbentrop Pact on 23 August 1938, a matter of days later Russia and Germany signed an amended clause, complete with a who-gets-to-annex-what after the war (see the German–Soviet Boundary and Friendship Treaty) plus the rather significant act of the joint operation to invade Poland.
If anyone clings to the idea of the first Molotov-Ribbenstrop Pact was just as honourable as that publicly tabled in August 1938, well why not - you can have those few days.
What is clear is that it was amended outside of public gaze just days later. Amazingly both Germany and Russia were logistically and militarily ready to start major invasions just a few days after the first Molotov-Ribbenstrop Pact and simultaneous with its first amendment. They must have teleported everyone in... we should have looked for those teleport scientists, rather than the rocket kind.