I'll provide you with all the evidence you like. Just so I'm clear, what is it about the Ukronazis you deny exactly? Their existence or what?

In fact, I declare that russians are Nazis!!! They do seem to act a lot like Nazis

That's just what you're hearing in the news. It's full of propaganda targeted at you.

Ukraine is sovereign country and fully recognized by Russia in the Budapest Memorandum.

Ukraine was not a sovereign country after the USA couped it. They ousted the democratically elected leader and then ignored the democratic vote that refused to accept the puppet the replaced him with. You can read about that here in this very well sourced write up, there are many like it. The part about the US ignoring the vote and forcing their puppet in is in part 2.

So, if the Freedom of Russia Legion goes into Belgorod and holds a vote… Then they can legally invite Ukraine in? And Russia will just lay down their arms?

No I'm sure Russia wouldn't accept that, same as Ukraine not accepting Crimea, Luhansk and Donetsk's choices. But if that happened and Russia had been ethnically cleansing Belgorod by banning languages and religions and shelling civilians, then I'd be siding with Ukraine on the matter.

Let’s ask the Chechens how their independence movement is going… I’m sure the Russians fully supports that

Look, I'm a communist. I don't like Russia. But I understand its motivations and they're not what we're being brainwashed with in the western media here. It could stage 20 more Ukraines and still not be as evil as the west and the USA in particular.