There have been enough threads and the distinction between Russia, it’s people and the meaning of flags so I don’t see the need to get into this again.
This has been said numerous times before and repeating the question won’t change the anwser.
National flags on OGS are just a symbol of nationality and/or language. It doesn’t mean that those users officially represent that country.
The Russian flag is not considered a symbol in support of Putin’s war.
If, at some point in the future, events would lead to a situation where the international community largely agrees that the Russian flag has become a hate symbol that should be banned, I expect OGS would adhere to such an international consensus.