Don’t know, but the Japanese leader visits their big shrine still. Causes a lot of strife with the Koreans and Chinese because many war criminals are enshrined there.
In their own country not in the country that was occupied.
No one is saying the Russians shouldn’t honor their own soldiers in their own country, just they shouldn’t go to a country that was ruthlessly assaulted by those troops and place a wreath commemorating the escapade in the assaulted country.
If nothing else it’s just bad form and poor manners.