The Republic of Surea Navy (朝本民國 海軍; Jupon Minggukku Umaikun), or 'ROS Navy (ROSN), is the maritime branch of the Republic of Surea Armed Forces, tasked with the naval defense of Surea. It has a large fleet with significant blue-water operating capabilities. The force is based strictly on defensive armament. Its main tasks are to maintain control of the nation's sea lanes and to patrol territorial waters. It has also stepped up its participation in UN-led peacekeeping operations (PKOs) and Maritime Interdiction Operations (MIOs).