The Zvezda Kh-35 (, AS-20 'Kayak') is a Soviet turbojet subsonic cruise anti-ship missile. The missile can be launched from helicopters, surface ships and coastal defence batteries with the help of a rocket booster, in which case it is known as Uran ('Uranus', SS-N-25 'Switchblade', GRAU 3M24) or Bal (SSC-6 'Sennight', GRAU 3K60). It is designed to attack vessels up to 5,000 tonnes. Development The previous anti-ship missiles made in USSR were highly capable, but they also were large and expensive. Therefore, the Soviet Navy found that a similar, small and very low flying missile would be useful. This new system was planned as small, cheap, and easy to install missile for a variety of platforms. This new system, called 3M24 Uran (in western nomenclature, SS-N-25) was originally meant for small surface combatants such as frigates, like the Krivak, Gepard and Neustrashimy. It was the answer to western missiles like the US Harpoon. Informally, it was also known as 'Harpoonski', as it was broadly comparable, especially in appearance, with the American missile. The initial development started in Zvezda-Strela State Scientific-Industrial Center (GNPTs) group in 1972 or 1977, depending on the sources. Zvezda received the official go ahead to begin work on the Kh-35 in 1983-1984 by a decree of the USSR Council of Ministers and the USSR CPSU Central Committee to arm ships of medium tonnage. Test launches began in 1985, but there were several problems and failures with the miniaturized active radar system. It was first displayed in 1992 and listed as only being intended for export, when it was, in fact, not yet for production. In 1994 India ordered Uran missiles (the Kh-35E export variant). This led to the full development, and deliveries started to the Indian Navy in 1996. Russia adopted it only in 2003 (for ships), and 2004 (Bal, coastal system). The air-launched variant (originally made for Indian Il-38SD patrol aircraft) was completed in 2005 and later deployed on Russian Federation aircraft. The KH-35 can be considered the successor to the SS-N-2 Styx missile, albeit much smaller and more modern. It boasts greater range than legacy missile systems, and is much cheaper than other contemporary anti-ship missiles like Kalibr or Oniks, costing an estimated $500,000 USD per missile. Design The Kh-35 missile is a subsonic weapon featuring a normal aerodynamic configuration with cruciform wings and fins and a semisubmerged air duct intake. The propulsion unit is