© Reuters. FILE PHOTO: A South Korean soldier walks past Hyunmoo-2 (L) and Hyunmoo-3 ballistic missiles ahead of a celebration to mark the 69th anniversary of Korea Armed Forces Day, in Pyeongtaek, South Korea, September 25, 2017. REUTERS/Kim Hong-Ji/File Photo

By Josh Smith

SEOUL (Reuters) – South Korea’s development of a conventional submarine-launched ballistic missile (SLBM) is a ground-breaking move, analysts said, with implications for North Korea, the U.S.…