GENEVA - North Korea's recent missile test-launch was a legitimate act of self-defense under international law and U. criticism of it a 'wanton violation of the sovereignty and dignity of the DPRK, a North Korean diplomat told the UN Conference on Disarmament on Tuesday. 'The DPRK will bolster its self-defense capabilities as long as the United States continues its hostile policies towards the DPRK and imposes nuclear threats and makes blackmail,' North Korean diplomat Ju Yong Choi said.