THE Chinese are openly debating "regime change" in Pyongyang after last week's nuclear test by their confrontational neighbour. Diplomats in Beijing said at the weekend that China and all the major US allies believed North Korea's claim that it had detonated a nuclear device. US director of national intelligence John Negroponte circulated a report that radiation had been detected at a site not far from the Chinese border. The US may have employed highly classified satellite technology to detect tiny leaks of gas or elements associated with nuclear detonation, according to a diplomatic source in the Chinese capital. This would...