because forcing a potential military confrontation between nuclear-armed opponents is always something that's been avoided since there've been nucelar-armed states. The potential consequences were and are potentially a lot worse than the deaths of a few hundred civilians.

made more than a peep of dissatisfaction?

with a credible threat of force. Things like that have the potential to escalate.

And "Europe" is not really a unified entity as such. The most credible response to Russian military action would come through NATO, not "Europe".

required they side with Obama and USA

If they didnt side with him on policy they sure as hell made him out to be a tough cowboy while Obama the wimp, when the opposite is what is actually true

Whoever launched the missile, whoever ordered it, and whoever financed it--those are the people at fault. We don't yet know who those people are, but it's increasingly sounding like it was Russian backed separatists.