there is no logic in War, and the most recent proofs of the statement "no plan survives first contact with the enemy" should be very very evident at the moment, so NK is gaining front line experience and has attaches in the Russian command, NK's entire popoulation are agricultural, they manualy grow food EVERYWHERE, and get around on bicycles, ie:they are all very fit. Then add in the truely surprising technical acomplishments of NK, nukes and somehow hacking the world from there web site, as I believe they only have one, and since flash doesn't work anymore its half blank. Also NK has an improbably vast supply of conventional missles and can maintain a continious barrage across the entire border for months.

The calculations for SK's strategic future will of course involve many other things, and happen from there own rather unique perspective where reunification will be something that both sides cant help but yearn for, and China, and Russia would be indifferent too, or supportive of. And SK is stuck playing the subserviant host to the US military, which must be great for morale, hey.