twisting event" that brought Pyongyang to the table and Hill did not explicitly warn Kim of negative consequences if talks collapse. But the official said if the six-party process fails, "obviously we will have to do something else." As a contingency, the administration has developed plans to interdict North Korean sea and air traffic and cut off financial flows from illegal missile, drugs and counterfeit currency sales. China and South Korea have urged Washington to show more diplomatic flexibility. Under the U.S. proposal, if North Korea agreed to end its plutonium and uranium programmes, South Korea and other U.S. allies could provide immediate energy assistance to the impoverished state. --More 2238 Local Time 1938 GMT