9M729

The cruise missile that ended the Cold War's most important arms-control treaty. The 9M729 (NATO: SSC-8 Screwdriver) is a ground-launched, nuclear-capable Russian cruise missile that Washington says flies far beyond the 500 km that the 1987 Intermediate-Range Nuclear Forces (INF) Treaty banned for land-based systems — and that Moscow insists stays just under it. The unresolvable dispute over its range was the proximate cause of the treaty's 2019 collapse, and reports of its combat use in Ukraine in 2025 turned a once-abstract arms-control argument into a battlefield reality.

Overview

The 9M729 is a ground-launched cruise missile (GLCM) developed by the Novator design bureau as part of the Iskander-K complex — the cruise-missile companion to the better-known Iskander-M ballistic missile. It is closely related to the sea-launched 3M14 Kalibr and the older RK-55, redesigned for road-mobile ground launch. The central fact of the 9M729 is political as much as technical: because the INF Treaty prohibited US and Soviet/Russian ground-launched missiles with ranges between 500 and 5,500 km, a Russian GLCM that exceeded 500 km was a treaty violation — and the US, with NATO backing, concluded exactly that, while Russia maintained the missile's range was a treaty-compliant ~480 km. That standoff, never resolved through inspection, drove the United States to withdraw from the INF Treaty in 2019.

Development

The 9M729 emerged from OKB Novator (within Almaz-Antey) in the early 2010s as a modernized member of a cruise-missile family stretching back to the RK-55 and overlapping with the naval Kalibr, per Wikipedia and Missile Threat (CSIS). Russia describes it as a modernized version of the 9M728 cruise missile already fielded with Iskander, "unified across most" components — its public position being that the 9M729 simply improved the warhead and guidance without breaching the 500 km line. US officials assessed otherwise: in early 2017 they reported Russia had deployed operational SSC-8 battalions, and the 2017 NASIC estimate put the missile's maximum range as high as 2,500 km. After years of accusations and a failed compliance dispute, the US suspended and then withdrew from the INF Treaty in 2019, with Russia following — ending the treaty that had eliminated an entire class of missiles in 1987.

Design & capabilities

The 9M729 is a subsonic, terrain-following land-attack cruise missile launched from a road-mobile transporter-erector-launcher resembling the Iskander's 9P78-1, but reportedly carrying a different missile count per vehicle. Open sources put its length at roughly 6–8 m and body diameter near 0.514 m — larger than the 9M728, which is part of why analysts believe it carries more fuel and thus more range, per Grokipedia. It is assessed as nuclear-capable as well as conventional. The range is the entire controversy: Russia officially claims ~480–490 km (conveniently under the INF threshold), while US intelligence assessed it well beyond 500 km, with estimates ranging up to ~2,500 km. Because the two sides never agreed on a verification regime for this specific missile, the true figure remains publicly unresolved — but the weight of allied assessment, and Russia's own behavior, point to an intermediate-range weapon.

Variants

The 9M729 is best understood within the Iskander cruise-missile lineage rather than as a branching family: it is the disputed evolution of the 9M728 (SSC-7) GLCM, both fired from Iskander-K launchers, and a cousin of the sea-launched 3M14 Kalibr and the air-launched Kh-101. No distinct sub-variants are publicly established.

Combat record / operational use

For most of its life the 9M729's "use" was diplomatic — the evidence in an arms-control fight rather than a weapon fired in anger. That changed in 2025: multiple outlets, citing Ukrainian and Western sources, reported the first combat use of the 9M729 in Ukraine, framed as the first battlefield employment of a missile that had been banned under the INF Treaty, per Defence Security Asia. These reports should be treated with appropriate caution — precise identification of a specific cruise-missile variant from strike debris is difficult, and the claims are not independently confirmed at the level of certainty that, say, Kalibr or Kh-101 use enjoys. What is firmer is the strategic significance: a missile whose existence helped dismantle the INF regime is now, by credible reporting, part of Russia's strike campaign, underscoring how thoroughly the post-INF world has arrived.

Advantages

• Intermediate reach (disputed) — credibly assessed to exceed 500 km, giving ground-launched cruise-missile range the INF once prohibited.
• Road-mobile and survivable — TEL-launched, hard to locate and pre-empt, like the rest of the Iskander family.
• Dual-capable — assessed nuclear- and conventional-capable, a flexible strategic/operational weapon.
• Family commonality — shares much with the Kalibr/9M728 lineage, easing production and integration.
• Strategic leverage — its existence reshaped the European missile balance and arms-control landscape.

Drawbacks / limitations

• Subsonic and interceptable — like other subsonic cruise missiles, more defendable than supersonic/hypersonic types.
• Opaque true performance — exact range and accuracy are unverified, obscured by the arms-control dispute.
• Political cost — its deployment shattered the INF Treaty, inviting reciprocal US intermediate-range systems in Europe and Asia.
• Uncertain combat record — 2025 use reports are credible but not firmly confirmed at the variant level.
• Finite, sophisticated — produced under sanctions pressure in limited numbers relative to cheaper strike options.

Counterparts

The 9M729 sits within Russia's Iskander-M/Iskander-K complex and shares DNA with the sea-launched Kalibr and air-launched Kh-101. Its strategic peers are Russia's newer long-range systems — the nuclear-powered Burevestnik and the Oreshnik intermediate-range ballistic missile — that further define the post-INF arsenal. Its direct geopolitical counterparts are the US ground-launched systems the INF Treaty's collapse unleashed: the Typhon launcher firing Tomahawk and SM-6, and the Dark Eagle hypersonic — American intermediate-range weapons now deployable precisely because the 9M729 helped kill the treaty that had banned them.

Outlook

The 9M729's legacy is structural: it is the weapon around which the INF Treaty died, and its story is really the story of Europe's return to an intermediate-range missile competition. Whether or not the 2025 combat-use reports are fully confirmed, the strategic trajectory is clear — a post-INF environment in which both Russia and the United States openly field and deploy ground-launched intermediate-range systems, with Europe again the central theater. The variables to watch into 2026–2027 are firmer confirmation (or refutation) of its battlefield use, the pace of reciprocal US deployments (Typhon, Dark Eagle) in Europe and the Pacific, and whether any successor arms-control framework emerges to replace the regime the 9M729 helped end.

Key specifications

Sources

1. Novator 9M729 — Wikipedia
2. 9M729 (SSC-8) — Missile Threat, CSIS
3. 9M729 — SSC-X-8 Screwdriver — GlobalSecurity.org
4. Russia Deploys 9M729 "Screwdriver" Missile in Ukraine — Defence Security Asia
5. 9K720 Iskander — Wikipedia

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