1. Threatening to join an openly hostile military alliance lead by US national interests that seeks to destabilise Russia as a threat to global dominance.
2. Removing an elected government via a CIA-backed coup so they can join aforementioned military alliance.
Russia tried for months to negotiate a peace deal where everyone is happy and no war happens but the Ukraine chose not to. Some men you just can't reach.
Ukraine asked for it time and time again but chose to aggravate Russia.
https://www.youtube.com/watch?v=mco4Ro6tMfs