On Sunday, North Korea launched a long range rocket many see as a test of its capability to launch a missile attack against the U.S., defying both American and Chinese pressure not do so. Republican U.S. presidential candidates argued Washington should press China harder to restrain Pyongyang. If the current mix of negotiations and sanctions are failing to prevent North Korea from advancing its nuclear program, do China and the U.S. need a new approach? What should each country do now and what can they do together?