The Korean Navy submarine Dosan Ahn Chang-ho, the frigate Daejeon, and the Canadian Navy submarine Corner Brook and the frigate Ottawa are performing tactical maneuvers during joint cooperation exercises between the Korean and Canadian naval forces held in the waters off western Canada on the 4th and 5th of last month. From left, Dosan Ahn Chang-ho and Daejeon. Provided by the Navy. The second 3,600-ton class submarine, scheduled to be deployed to the Navy in 2028, was the Goryeo Dynasty that prevented the Khitan invasion through diplomatic negotiations...