[AChimp]

China will side with the West in any future conflict. It would be economic suicide for them to do otherwise, and China's always good at looking out for #1. They also don't want the nearby countries (i.e. Taiwan) to start stockpiling their own weapons.

The best solution here would be to start starving North Korea. Complete trade embargo, and no humanitarian supplies. Your army can't fight if they're gnawing their own limbs off for food.