China Faces A Duo

Tension over Taiwan is heating up:

Japan is not seeking new friction with China after Beijing protested a joint Japan-US declaration expanding the scope of their alliance by declaring concern over Taiwan, Prime Minister Junichiro Koizumi says.

Now it's become more than just the US vs China on the matter. Is this primarily to leverage China to clean up their mess in N. Korea, or a standalone problem that is coming to a head? Or both?