North Korea part 2

Donald Trump threatens to solve North Korea. No one knows what he means, but I fear that he is seeking to divert attention from his ties to Russia. If he starts a war on the Korean peninsula and the US is losing, a distinct possibility against a much larger North Korean army, I think that Trump will resort to nuclear weapons rather than lose. If he nukes North Korea, North Korea will occupy South Korea. And if he nukes South Korea to save it, what then?