China would have too much to loose by supporting North Korea fully. For years they lobbied to get part of the World Trade Organization and have a better standing in the world community. I highly doubt that they would put all that in jeapordy...look at the effort they went to win the Olympics. They have already stated that they support a nuclear fre Korean peninsula. At the very least China would support a peacful solution and would abstain from any security council vote against North Korea.