[rmlew]

Sadly, the Ukranians threw their lot in with the communists and blamed all their resulting misfortunes on Jews.

[dfwgator]

Ukrainians slaughtered many Christian Poles as well during WWII.

[tlozo]

the Ukranians threw their lot in with the communists

Poland broke the Treaty of Warsaw(1920) and signed the Polish-Soviet Peace of Riga next year, Ukrainian territory found itself split between the Ukrainian SSR in the east, and Poland in the west (Galicia and part of Volhynia). Pilsudski felt the agreement was a shameless and short-sighted political calculation. Allegedly, having walked out of the room, he told the Ukrainians waiting there for the results of the Riga Conference: "Gentlemen, I deeply apologize to you".

https://en.wikipedia.org/wiki/Treaty_of_Warsaw_%281920%29

Jozef Pilsudski and Symon Petliura (1920)