AHC: Korea

Turn the Korean War into a UN Victory.

Bonus: MacArthur receives authorization to use nuclear weapons on North Korean and Chinese targets
 
Turn the Korean War into a UN Victory.

Bonus: MacArthur receives authorization to use nuclear weapons on North Korean and Chinese targets

See, to do so with your bonus provision would obviously result in massive tactical victories both in Korea and China, but strategically the UN would undoubtedly lose as it would start a nuclear war on the Korean peninsula.
Both Pyongyang and Seoul would be rubble, thousands of service men would be dead, along with millions of Korean civilians and politically the UN would be all but defunct.
 
Historically the Korean war was a UN victory. South Korea's sovereignty was preserved (plus the addition of some North Korean territory), the North Korean invasion totally defeated, the Chinese attempt to push the UN out of Korea also repulsed, and the Communist side sued for peace.

Having the UN side totally conquer North Korea would require bombing the Yalu river bridges and a greater commitment of forces. If the UN can muscle their way up to the Yalu they can simply hold indefinitely against any attempted Chinese crossings.
 
If the US chooses to use nuclear weapons after the Chinese intervention in late 1050 the USSR would only have a handful of nuclear weapons to oppose them.

If the US nukes targets in China I think Stalin would be too cautious to use the few weapons he had since that would then subject the USSR itself to a large nuclear counterattack. China might be willing to accept a peace agreement allowing Korea to unify under the South if they are subjected to nuclear bombardment with no way to respond.

I guess the main risk is if Stalin decides WWIII has started and needs to finish off the west now before the capitalists start nuking Moscow and has Soviet forces directly get involved in Korea while also invading western Europe.
 
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