FAKE-EDIT: Meant to post this hours ago, thought it went through but apparently a 504 ate it instead of posting. Idk if this has been sent since since I really only skimmed through the last handful of pages looking for my post, so I apologize if I'm just repeating something.
This is going to probably be the point in the century where the USA is shown to be the impotent floppy blancmange that it is and that Putin can do whatever he likes while they just sit and bluster. Putin can invade and annex other countries, overthrow governments, turn the tides in civil wars in his favour and there's nothing the USA can do about it.
Crimea 2014 is looking more and more similar to Sudetenland 1938
I was thinking exactly the same thing.
I think the only way we can retain the status quo is if US+EU+whoever else basically says "Putin, listen, don't annex Crimea because you'll piss everyone off and I don't think you want to fight WW3 over a tiny peninsula any more than we do. If Crimea goes independent and then has really good relations with you, even a pro-Russia government, as long as you aren't obviously pulling the strings, I think everything can settle. Crimea gets what they want mostly, Ukraine doesn't come out a complete loser because they got rid of your cronies in their government, you get a new ally which will regard you favorably and we don't look like we sat around with our thumbs up our asses. We can't really step into a region that wants to secede and look like the good guys, so we won't, but if you actually take Crimea... you're going to piss off a lot of people, and democracy can do pretty crazy things if that happens."
That's for the status-quo. Things will definitely change if it turns out this is just a vocal minority prompting Putin to steal away Crimea from Ukraine, in which case Putin did not act in the interest of Crimeans which will cause major problems. Worse is if the secessionist movement is found to have strong ties for Putin. If NATO steps in before then, we look like we're just being completely antagonistic to Russia. Which we kind of are, but everyone on any side really wishes it wasn't like that so everyone's hesitant.
FAKEEDIT2:
Oh lord I know when I'm not being heard. It's enough to say that nothing can stop Putin now, barring something weird.
Assuming of course that Western leaders and Putin haven't been talking to each other the entire time (that is, before or starting during Maidan) about keeping the status quo around.