You are entitled to your own opinion, but not to your own facts.

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...

I clearly looks like an alliance to take over other countries.

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.

Oh, the start of the war was awful in so many aspects, there were no rights. Second Polish Republic was aggressive state [1], [2]. It partitioned Czechoslovakia with Germany and Hungary in 1938. Soviets border on Poland lies about what was defined in Treaty of Versailles [3]. It does not excuse anything just show mixed things were. Have no idea about other parts of the German Soviet border [4].

[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...

Have you actually read the content?