Doug Bandow suggests:
Washington should begin contemplating, within earshot of Beijing, getting out of the way of its allies if the North continues to develop nuclear weapons. The message to China should be: if your client state continues its present course, you may face a nuclear-armed Japan. If that happens, blame your buddies in Pyongyang.
Read more at Time for U.S. to Disengage from North Korea Crisis | Doug Bandow | Cato Institute.