Look up some pictures from the top people active in what the west likes to call "Wagner group" of mercenaries, which are under direct control of a close Putin ally and also deployed in the Ukraine. They have literal tattoos based on SS Nazi uniforms and are showing them off on the internet openly.

Also read up on public declarations of Chechnyan military commanders in the Russian Army about waging Jihad in Ukraine...

The "Nazi collaborator" monuments are there not because of they collaborated with the Nazis (most Ukrainians don't even know this as it isn't taught in schools), but because these people also fought against Russian colonial oppression. Would be very strange to have monuments for that in Russia.