N.Korean missiles based on motor from ex-Soviet plant: report

North Korea's recent rapid progress in developing a long-range missile appears to have come after it refurbished rocket engines procured from a plant in the former Soviet Union, according to an expert report published Monday.According to Michael Elleman of the International Institute for Strategic Studies, the missiles used in recent North Korean tests were based on the RD-250 engine once made at a plant in what is now an independent Ukraine.North Korea has been testing missile technology since