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If another war starts in Korea, I see various POD's:
(1) North Korea invades South Korea
(2) South Korea and the USA invade North Korea to stop the missiles.
(3) There is a civil riot (caused by hunger?) in North Korea. Army units are sent to quell it, but instead join in, and the trouble spreads, and a civil war in North Korea starts between loyalists and anti-regime mutineers.