The leaders of China and South Korea, the only countries with any potential sway over North Korea, will meet on Friday to find a response to Pyongyang’s nuclear defiance. South Korean President Roh Moo-hyun and Chinese President Hu Jintao have both seen their policies of engagement with the North shaken by Pyongyang’s announcement on Monday that it had carried out a nuclear test, and both are reassessing their approach. Full Story