At 11:15 Moscow time on 12 May 2026, a plume of exhaust boiled out of a silo at Plesetsk Cosmodrome and the RS-28 Sarmat lifted from Russian soil for the first time in an operationally valid test. It was a moment that had been delayed, interrupted, and twice preceded by catastrophic silo explosions. Col. Gen. Sergei Karakayev, Commander of Russia’s Strategic Missile Forces, reported success. Vladimir Putin, who once called the missile the most powerful in existence, did not need to say anything further.

The Sarmat is not merely a new missile. It is the replacement for the R-36M2 Voyevoda, known to NATO as the SS-18 Satan — the largest ICBM ever deployed, the centrepiece of Soviet nuclear deterrence for four decades. Replacing the Satan with something more capable, more survivable, and more accurate is one of the defining objectives of Russia’s strategic modernisation programme. After years of public embarrassment, Moscow claims that programme is now complete.

The first operational regiment will be stationed at Uzhur, deep in the Krasnoyarsk region of Siberia, before the end of 2026. The Sarmat era in Russian nuclear doctrine has, officially, begun.

A Missile Built to Outlast Every Defence

The technical specifications of the RS-28 Sarmat read like a deliberate answer to every Western missile defence system deployed or under development. Range exceeds 35,000 kilometres — more than enough to reach any point on Earth via a southern polar trajectory that bypasses the missile defence radars and interceptors positioned in Alaska and Eastern Europe, which are oriented against a northern polar attack. The suborbital trajectory reduces the warning time available to adversary early-warning systems. By design, it is not simply a big missile. It is a missile engineered to make missile defence economically and technically irrelevant.

The payload capacity — estimated at 10 tonnes — allows the Sarmat to carry up to 10 independently targetable warheads (MIRVs), along with a complement of decoys and electronic countermeasures designed to confuse interceptors during the midcourse phase. Russian state media has also claimed the missile can carry the Avangard hypersonic glide vehicle as a payload, though the integration details remain classified. If that claim is accurate, the Sarmat adds hypersonic manoeuvring capability on top of its already challenging flight profile.

Structurally, the Sarmat uses a liquid-fuelled rocket engine — a technological choice that has advantages in throw weight and range but imposes constraints on launch readiness compared to solid-fuel alternatives like the American LGM-35A Sentinel. Russian strategic doctrine has historically accepted those constraints in exchange for raw payload capacity. The Sarmat follows that tradition, scaled upward.

The Long Road from Concept to Silo

The Sarmat programme began in earnest around 2009, following the decision to retire the ageing Voyevoda fleet on a fixed timeline. What followed was a development odyssey marked by technical delays, funding disputes, and two catastrophic accidents that destroyed testing infrastructure at Plesetsk. The 2024 explosion in a Sarmat silo during a routine maintenance operation was particularly damaging — not merely to the physical facility, but to the credibility of the programme’s timeline claims.

A second incident in 2025, details of which remain partially classified, further delayed the operational schedule. Western defence analysts who had grown accustomed to treating Russian missile programme announcements with scepticism were watching this one closely. The successful May 2026 test does not erase the programme’s troubled history, but it substantially changes the near-term assessment.

Karakayev’s public announcement of success, delivered through official Russian military channels, represents a calibrated signal. The details released — launch time, location, range achieved — are specific enough to be verifiable through third-party sensors, including the US Space-Based Infrared System and allied early-warning radars. Russia’s willingness to be specific suggests confidence in the test outcome. These are not the vague claims of a programme managing failure. They are the precise claims of a programme marking completion.

Deployment at Uzhur: What It Means Operationally

Uzhur is not a random choice. The missile base in Krasnoyarsk Krai sits at sufficient depth inside Russian territory to be considered survivable against all current US conventional strike options, while its geographic position provides flexible coverage of targeting options in both the Atlantic and Pacific directions. The existing base infrastructure, built for the Voyevoda, can be adapted for the Sarmat with modifications rather than complete reconstruction — a significant practical advantage given the time and cost constraints of the programme.

The first regiment will consist of a small number of launchers — estimates range from six to ten Sarmat missiles in the initial deployment. This is not the full complement of what Russia intends to field; the Sarmat programme is scheduled to replace the entire Voyevoda force over the next decade. But a regiment at Uzhur establishes operational credibility. The system moves from a test article to a deployed weapon.

For Western strategic planners, the Sarmat’s deployment forces a reassessment of missile defence utility. The Sarmat’s southern polar routing capability was always the feature most difficult to counter — it requires a fundamental redesign of interceptor positioning, not merely an upgrade of existing systems. The United States and its allies have been aware of this problem since Russia first disclosed the missile’s design parameters. The Sarmat going operational converts that theoretical problem into a concrete one.

The era of the Voyevoda is ending. The era of the Sarmat has arrived. And in the arithmetic of nuclear deterrence, the difference between a weapon under development and a weapon in a silo is not a detail. It is everything.

Sources: Russian Ministry of Defence, TASS, Reuters, Arms Control Association, Bulletin of the Atomic Scientists, US Strategic Command