KIM Jong-un has vowed to expand North Korea’s nuclear arsenal – as the tyrant revealed a new rocket launcher that can unleash “excruciating mental agony” upon his victims. Speaking in front of regime cronies at the test site, the North Korean leader announced he would “clarify the next-stage plans for further bolstering the country’s nuclear war deterrent”. It comes as Kim continues to groom his daughter, believed to be in her teens, to become his eventual successor, according to South Korean intelligence. The North Korean dictator is believed to have three children in total, an eldest son and two younger daughters. Earlier this month, Kim fired a volley of missiles hours before South Korea‘s leader travelled to China for a summit.