SEOUL, May 27 (UPI) -- North Korean leader Kim Jong Un oversaw tests of new tactical missile and artillery systems intended for frontline units near South Korea, state-run media reported Wednesday, as Pyongyang pushes to modernize its short-range strike capabilities. The tests conducted Tuesday included a newly developed lightweight multi-purpose missile launcher, a tactical cruise missile system and 240-millimeter guided artillery rockets equipped with ultra-precision navigation systems, the