The nazis during ww2 wanted to genocide the slavs and only keep small number of them around as slaves. Poland and the Allies enabled this genocide by refusing to ally themselves with the soviets. The fact the nazis invasion of the Soviet Union was a genocidal war was why they were so high of causities amongst the soviets.
The Soviet Union offered a anti fascism allying with the allies and polish mulitable times and got rejected multiable times so they where forced to negotiate a nonaggression pact with the nazis to buy time.
The soviet invaded Poland to stop the nazis form getting access to polish resources. Many poles welcome the soviet as liberators because polish have repeatly smashed it anti capitalism movement.
The soviet union is why there are still slavs today, the soviet union is the reason why eastern Europe is not colonized by the Germans. The soviet (and the Russians) is demonized because they successfully resisted European colonialism, because of this the hatred of Russia did not stop once the Soviet Union collapse.













