Testing the Depth of U.S.-China Cooperation

On Wednesday, 38 North, a website that tracks political and security developments in North Korea, released satellite imagery of the country's Punggye-ri nuclear test site that indicated Pyongyang is "primed and ready" to trigger a nuclear test explosion. The developments have riveted the attention of the United States and China on North Korea. In recent weeks, discussions over how to manage -- and, if possible, delay or halt -- North Korea's nuclearization have dominated the discussions between the countries. The challenge of North Korea's nuclear weapons program appears to have opened a window for limited cooperation in otherwise tangled negotiations over the numerous other issues the countries face....