In the late 50s, the USSR started studying the usage of
solid rocket motors and other modern technologies such as
turbojets in
ICBMs to improve their performance. From 1961 to 1962, several concepts of the missile were proposed at
OKB-586 and in 1963 development was transferred to their R&D, with the ultimate goal of creating an ICBM with a total mass of no more than 30 tons. In 1964, preliminary design of the missile was completed and test firings of the engines commenced in 1965. On September 27, 1967, the missile had its first test flight and from October 1967 onward, flight tests of the missile were carried out at the 53rd Scientific Research Proving Ground (53rd NIIP). On October 6, 1969, development of the missile was discontinued to unwillingness of the
Strategic Rocket Forces to work with a missile containing both liquid and solid propellant. Despite never being deployed, the missile provided the groundwork for other mobile ICBMs, such as the
RT-21 Temp 2S and the
RT-2PM Topol. ==Operator==