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The wild card is how the Chinese and Russians react. They never thought the Chinese would invade the first time. Things have a way of changing in war. It should be interesting if it ever happens. I am just sad that so many will be killed.
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Russia doesn't have a dog in this fight; no way to get any force there and no real reason to care about any Koreans.
After seeing DSII I doubt China wants to play. They wouldn't dare cut off the revenues, first; but they know that the "Human Wave" strategy is useless in the days of Stealth bombers and MOAB.
Think of what the Chosin battle would have looked like with stealth-capable all-weather planes and a mixture of CBU, MOAB, and Nape. Game over in the first period, mate.
Don't forget that Russia is no longer occupied and busy with Eastern Europe, as they were in the '50's. If China sent their entire army to Korea, we blasted a large part thereof; China just lost Inner Mongolia; the Russians would re-take, happily, the disputed areas there; the Islands, (names escape me) and whatever else.
As long as we cut the Chinese off; bleed the Koreans before comitting ground troops, and keep a scorched earth buffer zone around the Yalu, it's do-able.