Coup which wouldn't have happened if Russia didn't treat Ukraine like a vassal state not allowed to choose its own foreign policy.
Treat your allies like dirt, suffer easy opportunity for hostile change of guard taken by competition, lose allies. Very important lesson for Russia right there, one it was trying and failing to learn since centuries.
We all know that Maidan merely got western support, the sentiment behind it was brewing up since years and we can point out earlier events that contributed.
It is a ridiculous presumption that any revolution against a genuinely shitty government is inherently "western puppet coup" just because the west opportunistically supported that change, for obvious reasons.
Because Ukraine doesn't want to be "left alone" and for a damn good reason. Being "left alone" means staying poor while Russia waits for a good opportunity to bring it back into the fold by hook or by crook. It is an untenable position, why would Ukraine want to be in it.