They aren’t in NATO. There is no treaty that would require US or European intervention. A couple of years ago the Ukraine tried to join NATO, but it was never completed before Yanukovuych regained power (and he would have almost certainly exited NATO even if it happened). There is certainly a real threat that western European nations and the US would intervene if Russia invades. I think this threat is primarily based on deterring an invasion. But yes, if a civil war starts, it isn’t implausible that a proxy war could begin with the US and other NATO nations fighting against Russia.
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