Ukraine is a very important gas supplier to the whole of Europe, i wouldn't be so sure Europe/USA would back down so easily, plus i don't think the USA will want too be overpowered by the Ruskies, the whole thinking of America is not in the best interest of others.
i believe its just going to be another Syria
Syrian problems didn't affect a huge fucking pipe...
Again: NATO can whine and persuade but will not fight Russia on the ground.
USA is not going to bomb Russia (Too many white ppl there) and sure as fuck is not going to be starting of getting involved in a ground war against an actual opponent (shooting up Korean war era Iraqi tanks from jets is not fighting).
As we've seen, Rus have siezed an airfield and are reinforcing it with massed AA, and noone is in a position to challenge them on the ground.
Rus has already won, they probably won when they incited rioting in UKR, who knows how deep the machinations go, since they are led by a man who is literally top dog, he didn't get where he is by garnering voters support, he did it by being ruthless, and smart, and conniving, and is a brilliant man, there is no denying it. Now the Rus will get for free what before they got for pennies, and it has cost them very little.