The Novator Kalibr, also referred to as 3M54-1 Kalibr, 3M14 Biryuza, is a family of Russian cruise missiles developed by NPO Novator (OKB-8). It first saw service in 1994. There are ship-launched, submarine-launched and air-launched versions of the missile, and variants for anti-ship, anti-submarine and land attack use. Some versions have a second propulsion stage that initiates a supersonic sprint in the terminal approach to the target, reducing the time that air defense systems have to react, while subsonic versions have greater range than the supersonic variants. The missile can carry a warhead weighing up to 500 kilograms (1,100 lb) of explosive or a thermonuclear warhead.