The R-36 was a Soviet Intercontinental Ballistic Missile (ICBM). It was designated by the West as SS-9 Scarp. It was the first model that eventually evolved into a whole R-36 family of Soviet ICBMs. First cold-launch tests of the R-36 missile were conducted in January 1971. This original version, called the Mod.1, was able to carry a single nuclear warhead with a blast yield of 18-25 MT. This missile had a range of 11 200 km. Later the R-36 evolved into the improved R-36M (Western designation SS-18 Satan), capable of carrying a MIRV payload of 10 warheads. Each with 550-750 kT yield.
http://www.military-today.com/missiles/ss18_satan.htm
