Ok, I will not be defending those actions of NATO - I protested against my country involvement when possible and do agree about them being either dumb decisions (Kosovo) or straight up war crimes (Afghanistan). They shouldn’t have happend.
My point still stand though. NATO doesn’t threaten Russia borders. It could be called ‘Anti-Russia-Country-Club’, but even then the only things threatened by existence of NATO are post-USSR legacy and economic interest. Not exactly arguments to mount a large scale invasion/ethnic cleansing.
Ethnic cleansings in those territories are a fabricated casus beli for Russia ‘green man’. There were tensions between Russian and Ukrainian nationals in those territories, but I’ve seen no data on large scale extermination operations.
Ukraine engaged in a defensive war with a force clearly backed by their stronger neighbor that just laid claim to another piece of their land (Crimea). This was a land grab in all but name, no matter how much propaganda tries to paint it as a legitimate independence movement. Blame for casualties of that war lies entirely on separatists and Russia.