in no particular order
"It’s a USproxy war = Bonkers theory"
tell that to bo-jo and marco rubio.

"NatoExpansion provoked Russia = Bonkers theory"
yeah unfortunately theres a whole bunch of professors politicians intelligence and military ppls diplomats that would disagree with you. if you wanna list of names, just let me know. it's your "opinion" vs theirs
"There was acoup in Ukraine = Bonkers theory"
nothing was botched. all yanukovich did was postpone the signing of eu trade deal as he needed more time to evaluate pro's/cons of both the eu and rus offers. obviously the rus offer was more beneficial. the protests were organised and pre-planned. they were escalated by neo-nazis (that were literally backed by usa). theres evidence that far right shot into a crowd of protesters. they obviously stormed government buildings and murdered police.
who took power? an interim government handpicked by usa and led by turchinov. they are the ones responsible for launching an anti-russian ethnic cleansing campaign against russia aligned eatern regions.
your knowledge of the events seems to be based on headlines. try better.