North Korea claims 'successful' nuclear warhead test North Korea claims it has successfully tested a nuclear warhead that could be mounted on a missile, drawing condemnation from the South over the "maniacal recklessness" of young ruler Kim Jong-Un. IMAGES AND SOUNDBITES of reaction in Pyongyang + REFILES TO ADD NOTE: Ordinary North Koreans usually express only officially-sanctioned views when questioned by foreign news organisations.