The only reaction I saw from Russia so far is keep pointing out whenever they spot a Nazi on Ukranian videos.

To be honest this feels kinda effective, since Ukranians are not bothering in hiding the Nazi at all (most recent example: Zelensky made selfies near his bodyguards, and they were wearing concentration camp division tags on their uniforms...)

But when I talk to random people on street here in Brazil at least, it is more likely they believe in Ukranian propaganda than Russian propaganda just because they never heard of the Russian propaganda in first place.