The RS-28 РС-28 Сармат (also known as Sarmat, or Sarmatian) SS-X-30 is a future Russian liquid-fueled, MIRV-equipped, super-heavy thermonuclear armed intercontinental ballistic missile in development by the Makeyev Rocket Design Bureau from 2009, intended to replace the previous SS-18 Satan. Its large payload would allow for up to 10 heavy warheads or 15 lighter ones, and/or a combination of warheads and massive amounts of countermeasures designed to defeat anti-missile systems; it was heralded by the Russian military as a response to the U.S. Prompt Global Strike.
In February 2014, a Russian military official announced the Sarmat was expected to be ready for deployment around 2020. In May that year another official source suggested that the program was being accelerated and that it would, in his opinion, constitute up to 100 percent of Russia’s fixed land-based nuclear arsenal by 2021. At the end of June 2015, it was reported that the production schedule for the first prototype of the Sarmat was slipping. The RS-28 Sarmat is expected to become operational in 2016.