North Korean leader Kim Jong-Un is planning a “prime time” nuclear weapons push in 2017 to take advantage of leadership transitions in South Korea and the United States, a high-ranking defector said Tuesday. North Korean leader Kim Jong-Un delivers a speech to top delegates of the Workers’ Party of Korea in Pyongyang In his first press conference since fleeing his post as North Korea’s deputy ambassador to Britain in August, Thae Yong-Ho said Kim had issued a directive at a rare ruling party congress in May to “complete” nuclear development by the end of next year.