North Korea has tested a new type of solid-fuel engine for intercontinental missiles, state media reported on Tuesday. State news agency KCNA reported that ruler Kim Jong Un personally attended the ninth and final ground test of the new engine at the Academy of Chemical Materials in Pyongyang on Monday. According to the agency, the engine's maximum thrust is 1,971 kilonewtons, which would be extraordinarily high by international standards. The information provided by North Korean authorities cannot be independently verified. In recent years, North Korea has developed various types of intercont...