See, it's really quite simple. China's interests and our own are very often exactly the opposite.

Seriously, China may honestly believe that North Korea would see any condemnation by the UNSC as a declaration of war (the loony midget has been claiming that) and use it as a justification to attack.

China wants us to give up on South Korea which would strenghten China in the region. At the same time, they don't want Japan and South Korea to join the nuclear weapons club, which may happen if North Korea keeps up with the provacations. North Korea is demanding bilateral talks with the US only, and perhaps China thinks that'll be enough to get the loony midget to calm down, especially if we close our eyes and overlook North Korea's violations of the 1994 Agreed Framework and resume oil and food shipments.