RS-26 Rubezh

The RS-26 Rubezh, known to NATO as SS-X-31, is a Russian solid-propellant, road-mobile ballistic missile that was developed by the Moscow Institute of Thermal Technology beginning in 2008. It is reportedly derived from the RS-24 Yars but has fewer stages and a shorter range, and it is estimated at about 12 meters long and 1.8 meters wide, with a launch weight near 36,000 kilograms and an 800 kilogram nuclear payload that may be a single warhead or several independently targeted ones. Its first flight in September 2011 failed, a May 2012 test covered 5,800 kilometers with a light payload, and later tests flew about 2,000 kilometers with heavier loads. Analysts disagree on whether it counts as an intercontinental or an intermediate-range missile, and its heavier-payload tests raised questions about Russian compliance with the Intermediate-Range Nuclear Forces Treaty. Open sources describe it as still in development, with no confirmed deployment.