1. China would be the only military obstacle to any US invasion. The China of the Third Millennium is not the China of Mao, the communist China that mobbed the border to save a Korean communist regime. China is has turned away from the legacy of Mao and accepted that capitalism is preferable to communism and is adapting to a reality along those lines. In fact, China's success in that endeavor has resulted in tens of thousands of North Koreans fleeing across the border to seek jobs in Northeastern China. (Welcome to the free world.) The Chinese soldiers who fought for communist ideals are disgusted to see their sacrifices squandered for the preservation of a maniacal dictatorship that is destroying the people and land. It is hard to say whether China would involve itself again in a US attack on the North, but it is unlikely that it would again oppose the US.
2. Occupation. The hard part. Well, this is where S. Korea comes in. Remember, Korea is a divided nation, not two nations. The S. Korean regime can extend its administration North. If only there had been a S. Iraq.
3. Will the US actually do it? With all the US involvement elsewhere, I could see China doing this for herself before the US gets around to it.
North Korea probably can defend herself from US if China and Russia were alarmed about US expansion in the Far East. But there's no way North Korea could stand against the United States army alone, even with nukes.
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