Why don't you try to read the russian version of the wikipedia article on the Ribbentrop Molotov agreement? It is not as short as the catchy phrase "USSR and Germany were allies before 1941", but I think it gives a fuller picture of the events.

And while we are speaking about nazi allies here is one of the many links about the ties US had with nazi germany:

https://therealnews.com/d-day-how-the-us-supported-hitlers-r...

And then there is also the british royal family.

In my view, this gives a fuller description of the reality back then .