China's latest United Nations veto threat should convince even themost generous diplomat that Beijing is part of the problem in NorthKorea, not a "partner" in a solution. If it ever hopes to get asolution, Washington should now make Beijing's policy toward NorthKorea a vital test of China's ability and desire to be a"responsible stakeholder" in the international system.Specifically, the United States should insist on the introductionof the Japanese draft Chapter VII resolution proposing sanctionsagainst North Korea for noncompliance and allow China to use itsveto, if it follows through on its threat.