ICBM

North Korea has taken another step in its weapons buildup, with state media reporting that leader Kim Jong-un personally oversaw a ground test of an upgraded solid-fuel rocket engine, underscoring Pyongyang’s drive to sharpen its strategic arsenal. The launch test points to what appears to be Mr Kim’s continuing effort to expand and modernise a stockpile of intercontinental ballistic missiles (ICBMs) designed to reach the United States mainland. The announcement came just days after Mr Kim used a speech to North Korea’s…