A Russian nuclear-powered submarine and other naval vessels on June 17 left the port of Havana after a five-day stay. The Russian nuclear-powered submarine Kazan -- which Cuba said was not carrying nuclear weapons -- docked in Havana on June 12. Washington said it did not see the visit as a threat, but the U.S. Southern Command said on June 13 that a U.S. fast-attack submarine arrived at the naval base at Guantanamo Bay, Cuba, as part of a planned and routine port visit. A Canadian Navy patrol ship also docked in Havana. Ottawa said the ship arrived on June 14 to signal the "capable and deployable" nature of the Canadian military.