An undeclared North Korean ballistic missile base in the country's southwest hosts medium-range missiles capable of striking half of Japan and anywhere in South Korea, a U.S. think tank said Friday.The base in Kumchon-ni is located 75 kilometers north of the Demilitarized Zone dividing the two Koreas, 165 km northeast of Seoul and 1,100 km west-northwest of Tokyo, the Center for Strategic and International Studies said.Should the missile operating base, currently believed to host Hwasong-9 missiles, be equipped with newer weapons such as solid-fueled KN-15, "the threat envelope could includ…READ FULL ARTICLE