not clear at all. no mention about ww2 in his comment. moreover we did not talk about ww2 before, so this is most likely a watabolistic attempt justifying killing ukrainians because some of our ancestors were participating in pogroms of jews.

if we were talking about xx and previous centuries, then I would also mention crimes done by russians, poles and germans toward ukrainians

Regarding antisemitism, I would also mention that pogroms in the russian empire especially in places jews were allowed to live in (see the Pale of Settlement) and in europe were common.

Collaborants were everywhere in europe, america and russia. Regarding latter, see nazi-soviet parade in Brest-Litovsk as an example. But for some reason you only mentrion ukrainians and Bandera.