Russia’s S-400 and S-500 are both mobile, ground-based air defense systems designed to deter long-range threats. However, they are intended to perform different tasks within Russia’s broader air and missile defense network. The S-400 is a sophisticated system designed primarily to combat aircraft, cruise missiles and some ballistic missile threats. The newer S-500 is intended to expand these capabilities, with a greater focus on intercepting advanced ballistic missiles and potential targets at the edge of space.
The biggest difference isn’t just the range. It’s about the type of threat each system is designed to respond to, the interceptors and radars it uses, and how much of its advertised capability can be independently verified.
S-400: Russia’s established long-range air defense
The S-400 Triumf, known by NATO as the SA-21 Growler, entered service in 2007. It is designed to combat a range of airborne threats, including aircraft, drones and cruise missiles, while providing limited anti-ballistic missile capability. The system uses different interceptor missiles for different targets, rather than relying on one missile for each fight.
The stated maximum attack range of the S-400 depends on the missile used. The 40N6 family is associated with ranges of up to 400 kilometers (approximately 249 miles), while other interceptors have shorter ranges and different operational areas. This number should not be confused with the distance at which the system can reliably detect or engage any target: radar coverage, target altitude, and the target’s characteristics are all important.
The main task of the S-400 is therefore large-scale air defense. It can threaten aircraft and other aerial targets over a large area while providing more limited protection against ballistic missiles. However, it is not a dedicated replacement for any specialized strategic missile defense system.
S-500: A higher layer of missile defense
The S-500 Prometheus is intended to add a more specialized layer to Russian defense. Its planned capabilities include intercepting ballistic missiles and, according to Russian sources, certain hypersonic weapons and targets in low-Earth orbit. The system is linked to the 77N6 family of interceptors for ballistic missile defense and the 40N6M for aircraft and cruise missile targets. The latter reflects some overlap with the S-400, rather than an entirely separate set of capabilities.
Open source estimates put the S-500’s maximum intercept range at about 500 to 600 kilometers (310 to 373 miles). However, these numbers do not correspond to a verified attack range against all types of targets. Its radar package also combines general air surveillance with specialized tracking and combat of ballistic threats.
Claims that the S-500 can intercept hypersonic weapons or satellites deserve particular caution. Publicly available information does not independently demonstrate the full capabilities of these capabilities, and details about the system’s most specialized interceptors remain limited.
The S-400 is the more established and widely deployed system, designed for much of Russia’s long-range air defense network. The S-500 is a more specialized addition designed to bolster defenses against sophisticated ballistic missile threats and potential targets at near-space altitudes.
Their roles overlap, but the S-500 is not simply an S-400 with a longer-range missile. It uses a different combination of radars and interceptors to combat threats that require more specialized tracking and interception. In principle, the two systems can complement each other: the S-400 addresses a wide range of airborne threats, while the S-500 adds a higher level of missile defense.
Russia announced in December 2025 that its first S-500-equipped regiment had entered combat operations. However, officials provided few operational details, and public information about the number of systems, deployment configuration and proven performance remains limited.
