SS-18 Satan

SS-18 Satan
ISC Kosmotras · CC BY 2.5 · source
Name	SS-18 Satan
Caption	An R-36M2 Voevoda missile on a transporter-erector-launcher
Type	Intercontinental ballistic missile
Origin	Soviet Union
Used by	Soviet Union / Russia
Designer	Yuzhnoye Design Office
Manufacturer	Yuzhmash
Production date	1975–present
Service	1975–present
Engine	Two-stage liquid-propellant
Weight	209,600 kg
Length	34.3 m
Diameter	3.0 m
Vehicle range	11,000–16,000 km
Guidance	Inertial navigation system
Launch platform	Silo

SS-18 Satan. The RS-28 Sarmat is a Russian liquid-propellant intercontinental ballistic missile (ICBM) developed during the Cold War by the Soviet Union's Yuzhnoye Design Office. Designated as the R-36M and later modernized as the R-36M2 Voevoda, it remains one of the most formidable strategic weapons ever deployed, known for its massive throw-weight, multiple independently targetable reentry vehicle (MIRV) capability, and hardened silo basing. Its introduction significantly escalated the arms race and shaped nuclear strategy and arms control negotiations for decades.

Development and design

The development of this system was initiated in the late 1960s under the leadership of Vladimir Chelomey's rival OKB-52, though the project was ultimately awarded to Mikhail Yangel's Yuzhnoye Design Office in Dnipro. The primary goal was to create a successor to the earlier R-36 (SS-9 Scarp) with vastly improved survivability, accuracy, and payload to counter emerging United States missile defense concepts and the new Minuteman III ICBM. Key design innovations included a cold launch technique from a heavily fortified silo, a powerful two-stage liquid-propellant rocket engine, and a post-boost vehicle capable of deploying up to ten MIRV warheads. The missile's sheer size and destructive potential were central to the Soviet concept of a guaranteed retaliatory strike, a cornerstone of their mutual assured destruction doctrine.

Operational history

Entering service with the Strategic Rocket Forces in 1975, the initial Mod 1 variant was first deployed at bases across the Russian Soviet Federative Socialist Republic, including sites in Kazakhstan and the Ukrainian Soviet Socialist Republic. Subsequent deployments during the 1980s, particularly of the Mod 4 and Mod 5 variants, represented the peak of Soviet strategic land-based power, with hundreds of missiles on constant alert. Following the Dissolution of the Soviet Union, missiles based in newly independent Kazakhstan and Ukraine were transferred to Russia or dismantled under programs like the Cooperative Threat Reduction initiative. The system has remained a key component of Russia's nuclear triad, with ongoing life-extension programs ensuring its service continues into the 2020s, even as its successor, the RS-28 Sarmat, begins deployment.

Technical specifications

The missile is approximately 34.3 meters long, 3 meters in diameter, and has a launch weight of over 200,000 kilograms. It utilizes a two-stage liquid-propellant design with storable propellants, allowing for prolonged readiness. The guidance system is a sophisticated inertial navigation system providing the accuracy necessary for hard-target kill capability against fortified installations like Cheyenne Mountain Complex. The most capable variants have a maximum range of up to 16,000 kilometers and a massive throw-weight of nearly 8,800 kilograms, enabling it to carry a payload of ten MIRVed thermonuclear weapons, each with a yield estimated between 500 and 750 kilotons, or a single high-yield warhead of up to 20 megatons.

Variants

Several major variants were produced, each representing significant technological leaps. The Mod 1 (RS-36M) carried a single reentry vehicle, while the Mod 2 introduced a MIRV bus with up to eight warheads. The Mod 3 featured improved accuracy and a single high-yield warhead. The definitive Mod 4 (R-36M UTTH) and Mod 5 (R-36M2 Voevoda) variants, developed in the 1980s, incorporated enhanced guidance, more powerful engines, and the capability for ten MIRVs, along with countermeasures designed to penetrate potential Anti-ballistic missile systems like the Strategic Defense Initiative. The RS-28 Sarmat is designed as its eventual replacement.

Strategic role and arms control

The system's deployment fundamentally altered the strategic balance, presenting the United States with a severe counterforce threat to its Minuteman III silos and compelling responses like the MX Peacekeeper missile. Its capabilities were a central concern in major arms control treaties, including the Strategic Arms Limitation Talks (SALT II), which limited MIRV counts, and the Strategic Arms Reduction Treaty (START I), which mandated significant reductions. Subsequent agreements like New START have further limited deployed numbers, though the missile's enduring presence continues to be a critical factor in Russia-United States strategic relations and modern debates on nuclear modernization and deterrence theory.

Category:Intercontinental ballistic missiles of the Soviet Union Category:Cold War missiles of the Soviet Union Category:Nuclear weapons of Russia