The Poles were invaded by the Nazi’s. Real ones. And later on the Ukes joined in the Holocaust happily shooting trench loads of Jews.
And as to the Czechs?
Hmmmm.
A place called Munich in 1938 comes to mind when the West sold them out to Hitler.
Poland in 1939 was an authoritarian state with no real civil liberties and a strong antisemitic streak.
Ukraine has been invaded by Nazis, or more likely fascists, real ones. See TIK for definitions if you like.
Czechoslovakia was itself a semi-socialist, nationalist state with not entirely clean hands vis a vis national minorities. Thats one reason Slovakia immediately broke away in 1938 and became enthusiastically Nazi.
You can always find fault in a victim, if you favor the criminal.