North Korean leader Kim Jong-Un inspects an artillery firing drill of the Korean People's Army units in an undisclosed locationSEOUL (Reuters) – Contemporary U.N. sanctions are unlikely to halt North Korea's nuclear software provided that seven years of earlier measures from the world body and more than 50 years of U.S. penalties have failed to dissuade North Korea from looking to improve banned weapons. Below new chief Kim Jong-un, the North has pursued its nuclear application much more aggressively, specialists in Seoul mentioned. The 30-12 months previous Kim, in power for just over a year, additionally seems more willing to shun China, his sole powerful backer, than his father Kim Jong-il was once, one of the vital consultants stated. The U.N. …