They should try advance through minefields as vast as an ocean and then criticize.

Not gonna argue with that. USSR was definitely more covert in its ethnic cleansings. Although the Russian polizei collaborators in Eastern Europe (Belarus to be exact) were more than eager to hand in my grandad's family to the SS. It was actually thanks to an SS officer showing some compassion that he and he his sister managed to evacuate. And some argue that up to 5 million Jews went through Soviet gulags although it's near impossible to verify. My main point being is that the nazi Germany system was destroyed and punished (and reformed by external forces), but the Soviet never was and that's why we're here with the likes of Poo-boy.

True. Russia has been woefully antisemitic since forever basically. Russians in general hate Jews for no reason whatsoever (I know I am a Russian and a Jew). USSR too. Gulags were full of Jews, you can even see it in the prison slang which is full of Yiddish/Hebrew words. My grandpa had to hide the fact he was a Jew to get the party ticket which was necessary to advance in his career (he was a scientist).

I'm sorry for your loss, glad to hear he had a caring family.