@hawkeye10,
Mmm. Not sure SK and China share the same ulterior motives. I pretty sure SK would welcome a NK collapse. I don't think they're really all that afraid of the possibility that NK would commit suicide by launching a full-scale military attack. And even if they did, the chances that they could sustain it long enough to do serious damage are minimal. Large and mid-size incoming missiles are well defended against down here, and NK lacks strategic fuel and rations in reserve to fuel an extended campaign. Most defectors to the South say that at least half of the rank-and-file in the military would desert
en masse at the first signs of a major conflict. Most of them are in the military just for food, they say.