Meh. I highly doubt that...if anything Russia might want a crack at gaining some Valuable North Korean Property if the Situation arose. China doesn't seem that interested in Korea anymore, anyways, because China is less about spreading ideology and more about protecting the interests of their people. Japan wouldn't want to upset the balance, so they would probably remain aloof (but on guard), and I believe South Korea would have the backing (and maybe a few divisions) sent from European countries, mostly The UK, Belgium, Spain, Italy, and Germany. The Former Soviet Bloc Countries could hardly give a rat's *** about the interests of Russia, in fact, many Former Soviet Bloc countries greatly resent Russia...

Basically right now, Kim Jong-Ill doesn't really have any support. The Only Reason why China has any interest in North Korea right now, is so that Kim might be a little more lenient on economic agreements that might benefit China.

Oh, and Mr. Ill wouldn't have to worry just about the US, they'd also have to Worry about ANZAC being not very close behind the US in response. Ummm...yeah...The Domino's will fall like a house of cards...checkmate.