Not really. They mostly started coming after the USSR stopped the Nazis in 1942.
"complicated history of the USSR and the Nazis"
Too bad your school forgets to mention the Munich agreement between the Nazis and the West, and all the efforts of the USSR to forge an anti-Nazi pact with the Great Britain and France. All of which happenned before the M-R pact.
But its not like after Munich, Britain and France invaded the rest of Czechoslovakia while Hitler took the Sudetenland, so bad as it is, it doesn’t compare to the Molotov-Ribbentropp pact.
The USSR only took back what your lively European hyena bit off from the corpse of the Russian Empire 20 years before that [0].
That's exactly the problem with cherry-picking Molotov-Rippentrop pact.
And btw no one of significance has ever called Russian Empire a hyena. Unlike Poland.
But Poland and Hungary did [0].
[0] https://en.wikipedia.org/wiki/Occupation_of_Czechoslovakia_(...
Zhukov: "People say that the allies didn't help us. But it cannot be denied that the Americans sent us materiel without which we could not have formed our reserves or continued the war. The Americans provided vital explosives and gunpowder. And how much steel! Could we really have set up the production of our tanks without American steel? And now they are saying that we had plenty of everything on our own."
School might also have noted the complicated history of the USSR and the Nazis; things like the Molotov–Ribbentrop Pact.