Very delicate issues.
Bush wants to launch military options but resources is low and he will not be able to win majority votes next term.
China is shocked or in cahoots. South Korean and Japan both rely heavily on US's opinions and probably stand by it.
N.Korean is still the insane state. I doubt their technology in developing a nuclear missile. They might have recently developed some advancement, thus showing off to the world, the stages of their plan.
1) Missile Test without Nukes.
2) Nuclear reaction test in underground tunnel.
3) Missile test with payload similar to Nuke head.
4) Missile test with small amount of Nuke. Deep down Sea of Japan or North of North Korean. (The chinese might encourage this testing ubt certainly don't want a Nuke in N.Korean hands) It's a direct threat to themselves too.
or before step 3 can take place, drastic measures are imposed. The UN can sanctions but it's the people that's suffering there.
Maybe an assasination on Kim Jong iL.... nah... you still have the rest of the army to take care.
Wait and see for us.