This is a tough one...and there is great blame. I have been to the Yad Vashem museum and seen what the Ukrainians did to their Jewish brothers and sisters. I think many of the Ukrainians blamed the Marxist communism and the Bolsheviks, who they believed were Jewish led, for the Holodomir. But ironically it is the Jewish Messiah that is changing their hearts...
My memory of persons involved in the Russian revolution is that Jewish people outside of Russia were behind the overthrowing of the Czar.