(LEAD) N. Korea building new missile bases, silos along east coast: Report SEOUL, Aug. 3 (Yonhap) -- North Korea has been constructing new underground missile bases and silos along its east coast in recent years to deploy intermediate-range rockets targeting Japan and U.S. military facilities on the archipelago, a report said Thursday. "The new bases clustered along the east coastal line, in particular, are short- and medium-range missile bases aiming at Japan and U.S. military installations in Japan," said a report written by Yun Deok-min, a security expert at the state-funded Institute of Foreign Affairs and National Security. About 200...