Okay I'm assuming this isn't a strawman and maybe you didn't read the whole conversation, but my original point was that no proof has ever been presented that the rebels used a Russian supplied Buk and not one of their own Buks. Obviously we know it was statistically likely to have been a Russian one as the rebels only had half a dozen or so and the Russians are rumoured to have sent dozens more into the area but we don't actually know it for sure and probably never will. Not that it's that important as what happened wouldn't have without Russia's decision to back the eastern rebels, so Putin and Russia are definitely culpable.
So basically the exact same way we responded when they invaded Afghanistan, great, that played out real well in the long run, especially our boy Osama xD
Not sure what you've been reading but Russia + Ukrainian rebels vs Ukrainian loyalist forces would be a straight up face roll. Wales would stand a better chance against England
To put it in perspective, back when Crimea seceded and re-joined Russia the military analysts were estimating Putin could take Kiev in under two weeks.
Worst case scenario, Russia and China coordinate the timing of their invasions. The west simply wouldn't have the resources to respond to both at the same time, and that's assuming the US would even commit resources to fight Russia and/or China in defence of a non NATO ally (whether they would do so in defence of an actual NATO ally has always been a subject of great contention).
