Something you have to understand about Russia supporters in this conflict is that most of them are non-White. This might not be obvious at first. Online, and especially on an anonymous imageboard, it's easy to just imagine that the person you're talking to is the same race as you, and if you're White, you'll probably assume the people defending Russia are White too.
I visit a conventional forum centered around video game discussion (mainly RPGs). However, as with most forums, it has some off-topic sections, and naturally politics and current events are discussed there. It has very hands off moderation, and has a lot of open political extremists there - far right, far left, etc. Because it has user accounts, it's possible to gradually notice and remember what race a given poster is, if they mention it once.
As it turns out, pretty much all the far left crowd there, and most of the people supporting Russia in the conflict, are non-White. Not only that, but pretty much all their commie bleating is interwoven with whining about White imperialism, evil Whitey keeping the poopskin down, strong China will destroy Whitey, etc. The people supporting Russia aren't well-intentioned but misguided White people. They're butthurt poopskins who hate White civilization, see Ukraine as the White side and Russia as the non-White side, and support Russia because they see it as a proxy for them to attack and destroy White civilization.
They may use antisemitism, terms like ZOG, etc., when condemning Ukraine, only because they think it will be enough to trick racially aware White people into dropping support for Ukraine and siding with the multi-ethnic Russian state where antisemitism is literally illegal and they fervently celebrate the time they went to war with Nazi Germany on the jews' behalf.
tl;dr Russia supporters are butthurt poopskins who spend their days seething about how their people accomplished nothing of value through all human history.