We're in a situation where the hate between both sides is very close to the surface, no one is trying to hide it anymore.
All that's needed now is one excuse... as it happened so many times before, for centuries... one small thing - an important figure murder, a bomb that lands on the wrong side of the border (accidentally?)... the destruction of NordStream, which I thought would be enough to start a full scale conflict with Russia, but for some reason hasn't yet (though it remains to be seen). It's very clear that what we're seeing today looks exactly like what we saw just before other large wars: a mostly regional conflict that serves as a proxy conflict between the bigger players causes the hostile rethoric on both sides to grow more and more, until the population not only supports a conflict, but demands it. Whether or not the news are telling the truth (which anyone who was there in previous situations like this, including Iraq not so long ago, knows is full of lies and uncontested half-truths from both sides) doesn't even matter anymore. It's a matter of time, you can be sure of that.
It was a scurrilous, unprincipled deal (much like Poland's deal with Germany to divide up Czechoslovakia a year earlier), but the Soviets didn't make it because they were friends with Germany. They had actually preferred to sign an alliance with France, in order to protect Czechoslovakia, but that had failed due to a lack of willingness from France and a refusal by Poland to allow Soviet troops to cross Poland to reach Czechoslovakia (for some reasons that were understandable, given that the USSR and Poland had recently fought a war, and also because Poland itself wanted a piece of Czechoslovakia).
https://en.m.wikipedia.org/wiki/Operation_Barbarossa
https://en.m.wikipedia.org/wiki/Case_Blue
https://en.m.wikipedia.org/wiki/Battle_of_Stalingrad
https://en.m.wikipedia.org/wiki/Battle_of_Kursk
https://en.m.wikipedia.org/wiki/Operation_Bagration
https://en.m.wikipedia.org/wiki/Siege_of_Leningrad
Just some friendly highlights. Feel free too look up all the others.