UR-100N

The UR-100N, also known as the RS-18A, is a Soviet and Russian intercontinental ballistic missile with the NATO reporting name SS-19 Stiletto and the industry designation 15A30. It is a fourth-generation, silo-launched, liquid-propellant missile, larger and more capable than the earlier UR-100, and it required newly built silos. Development began at the OKB-52 design bureau in 1970, flight tests ran from 1973 to 1975, and the missile reached initial operating capability in 1974, with an inventory of 190 launchers by 1978. It carries six MIRV warheads, can be readied to launch in 25 minutes and has a storage life of 22 years. The improved UR-100NUTTKh (SS-19 Mod 3) entered service in 1979 and peaked at 360 launchers in 1983. After the Soviet collapse, missiles in Ukraine were dismantled or returned to Russia under START I. Russia's Strategic Missile Troops still operate a small force, rearmed with Avangard hypersonic glide vehicles since 2019, and the missile is the basis of the Rokot space launcher.