After missile failure, higher possibility of North Korea nuclear test

By Jack Kim SEOUL (Reuters) - The possibility of North Korea conducting a fifth nuclear test, possibly within weeks, has been heightened by a failed missile launch on Friday that was an embarrassing setback for leader Kim Jon Un, South Korean officials and international experts said. North Korea holds a ruling Workers Party congress in early May, at which Kim is likely to trumpet his achievements in building up Pyongyang's weapons prowess. The South Korean officials and experts say he will be ke