saudi-yemen? why isn't saudi being sanctioned and bombed for committing more of these "human rights" crimes? oh wait, they are allies.
Had I followed along with this ruse, it would be trivial to keep piling on another country's bad behavior until the actual issue (Russia invading and annexing a neighbor) eventually gets buried in the noise from the resulting back-and-forth. And it often works because onlookers are fooled by the sleight-of-hand, while the accuser is left on the defensive because the subject has now shifted to something different of the interlocutor's choice that cannot be defended.
They're called logical fallacies because they give the appearance of logical argument, but are actually invalid and prove nothing (and are in fact deceptions). I suggest you read up on them; I posted a link to the tu-quoque fallacy earlier.
Secondly, I'm yet to see a proof that it's indeed a fallacy, as you are yet to demonstrate how exactly OP's appeal to common standards is an unsound argument causing faulty reasoning. You're just evading the argument altogether whilst calling it a fallacy. I bet you're either cherry-picking definitions or not fully understanding the meaning of the term, especially when it serves your intent to hide your lack of consistency on the subject matter of military conflicts.
I agree with they OP that this is a proxy war but it's ultimately between china and the USA. Both Russia and Ukraine are caught as pawns in a much larger game. You only have to look at which companies are allowed to bypass sanctions to sell and see it's a game being played with the lives of people. Very sad.
If they win, they keep their country and sovereignty. If they lose, the conquering neighbor takes their land and kills their leaders.