MOSCOW, July 19 — The 9K720 Iskander, known to NATO as the SS-26 Stone, is a Russian mobile short-range ballistic missile family that has become a central fixture in the escalating arms debate between Moscow and Washington. On closer reading of its technical history, the system’s evolution reveals a pattern of deliberate capability expansion — and cost control — that has kept it in production for nearly two decades. Development began in December 1988 under designer Sergey Nepobedimy, with the first successful launch in 1996.
Serial production of the Iskander-M variant started in 2006, when the Russian army adopted it. The core M model has a stated range of 500 kilometres (270 nautical miles; 310 statute miles).
That range figure is critical: the United States has argued that the cruise missiles used by the Iskander-K variant — the 9M728 and 9M729 (NATO: SSC-X-7 and SSC-X-8) — violate the Intermediate-Range Nuclear Forces Treaty because their estimated range exceeds 500 kilometres.
The mechanics of a cost overhaul
Follow the money, and you find a striking supply-chain restructuring. In 2014, according to the developer, production costs were slashed by a third. The catch: that saving came from reducing a cumulative 810% markup across the supply chain to a 21% markup on the finished product.
The eight-fold-plus overhead figure suggests a system where component suppliers had, for years, been charging far above production cost, nearly doubling the price at each link. Bringing that down to 21% — still a healthy margin — required a top-down reorganisation of the procurement chain.
It is the sort of hard-nosed industrial reform that a business desk would recognise: not a technological breakthrough but a financial one.
Warheads and flight control
The Iskander-M can carry a range of conventional warheads: cluster munitions, fuel-air explosive enhanced-blast, high-explosive fragmentation, an earth penetrator for bunker busting, and an electromagnetic pulse device for anti-radar missions. It can also carry nuclear warheads. The missile itself is a solid-propellant single-stage guided model — the 9M723K1 — controlled throughout flight with an inseparable warhead.
Flight guidance uses an optically guided warhead that receives encrypted radio transmissions from AWACS or UAVs, allowing the weapon to be re-targeted in flight for engaging mobile targets. During the boost phase, thrust vector control is achieved via graphite vanes, a design reminiscent of the V-2 and Scud series.
The system uses two such missiles per launcher. In September 2017, KBM general designer Valery M. Kashin stated there were at least seven types of missiles for the Iskander family, including a cruise missile.
That breadth of munitions options makes the platform a flexible tool for both tactical strikes and strategic signalling — a point that does not get lost on Western defence analysts.
Modernisation and precision upgrades
In November 2016, the Russian military announced a modernisation of the Iskander-M system. Then, in April 2024, the system’s developer stated that missile precision had been improved since the start of Russia’s invasion of Ukraine. While no specific accuracy figures were given, the statement itself is notable: it frames the war as an opportunity to field-test and refine the weapon’s guidance, likely through combat data collected from actual use.
The source does not detail whether those improvements involved hardware upgrades, software tweaks, or both, but the pattern is consistent with many Russian weapons programmes that see active warfighting as a development laboratory. The Iskander’s range and speed — it is a short-range ballistic missile, meaning a high-arc trajectory with limited flight time — make it difficult to intercept with most existing missile-defence systems.
That fact underpins Washington’s concerns about the INF Treaty breach. If the cruise-missile variant indeed has a range beyond 500 kilometres, it would fall into a category that the treaty was designed to eliminate entirely. The US administration under President Donald Trump has taken a hard line on such violations, though the specifics of any retaliatory steps remain classified.
On balance, the Iskander story is less about a single weapons system and more about the intersection of military strategy, industrial cost discipline, and treaty compliance. The mechanics here are straightforward: a mobile launcher, a family of missiles, a supply chain squeezed for savings, and a range figure that sits at the edge of a binding international agreement.
What comes next — further modifications, arms-control negotiations, or a new generation of systems — will depend on how the political calculus shifts in both Moscow and Washington.
