Ukraine Reveals New Russian S-71K Kover Cruise Missile Designed for Su-57 Stand-Off Strike Operations.

Russia’s S-71K Kover provides the Su-57 with an additional stand-off strike capability intended to engage defended targets without requiring the aircraft to penetrate deeply into Ukrainian air-defense coverage. Its reported operational use and estimated range of up to 300 km suggest a broader Russian effort to adapt advanced combat aircraft and unmanned platforms into long-range missile carriers, thereby expanding launch options while reducing exposure to surface-to-air threats.

The missile combines an R500 turbojet engine, a 250 kg OFAB-250-270 high-explosive fragmentation warhead, a relatively basic inertial navigation architecture, and foreign-sourced electronic components to conduct powered attacks against fixed or pre-surveyed targets. If integrated with the S-70 Okhotnik unmanned combat aerial vehicle, the S-71K could support a more distributed strike model in which unmanned platforms carry weapons closer to high-risk airspace while crewed aircraft remain at greater stand-off distances.

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Ukraine’s intelligence service revealed that Russia has deployed the S-71K Kover, a 300 km-range air-launched cruise missile designed to expand the strike role of the Su-57 and potentially integrate with the S-70 unmanned combat aircraft (Picture Source: Russian reports / Main Directorate of Intelligence of the Ministry of Defence of Ukraine/ Army Recognition, protected illustration, reproduction prohibited without permission)

The Main Directorate of Intelligence of the Ministry of Defence of Ukraine, also known as Defence Intelligence of Ukraine and by the Ukrainian acronym HUR, disclosed on April 27, 2026, new technical details on Russia’s S-71K “Kover”, an air-launched cruise missile developed by the United Aircraft Corporation for employment from the Su-57 fighter aircraft. Published through the War & Sanctions portal, the disclosure includes an interactive 3D model, information on the missile’s main components, and a breakdown of its electronic component base. Beyond the identification of a new Russian weapon, the data points to a broader evolution in Russian aviation warfare, in which manned combat aircraft, unmanned strike platforms, compact cruise missiles, and foreign-sourced electronics are being combined to expand stand-off strike options against Ukraine.

According to HUR, the S-71K was first used by Russian forces in late 2025 and appears to represent one of the first missile-development efforts by the United Aircraft Corporation. This point is central to the weapon’s significance. Rather than treating the Su-57 only as an air-superiority fighter built around low-observable design, sensor fusion, and long-range air-to-air engagement, the Kover suggests a parallel Russian effort to turn the aircraft into a stand-off strike platform. With a projected range of up to 300 km, the missile could allow Russian mission planners to launch from outside many short- and medium-range air-defense engagement zones, depending on altitude, release geometry, radar coverage, and the disposition of Ukrainian surface-to-air missile systems.

The missile’s construction reflects a pragmatic approach to air-launched weapons development. HUR states that the S-71K uses a 250 kg OFAB-250-270 high-explosive fragmentation aerial bomb as its warhead, integrated into the load-bearing frame of the missile’s forward section. This indicates that the weapon is not built around a newly designed specialized warhead, but around the adaptation of an existing aerial bomb into a powered cruise-missile architecture. Operationally, such a payload would be relevant for strikes against fixed targets, including infrastructure, logistics nodes, exposed military facilities, ammunition storage areas, command sites, or airfield-related targets. From an aeronautical perspective, the integration of a conventional bomb into the forward structure also imposes design constraints related to center of gravity, longitudinal stability, separation behavior, and flight-control authority after release from the carrier aircraft.

The airframe data published by HUR also shows a design focused on weight control, manufacturability, and structural reinforcement rather than confirmed low observability. The missile body is made from a multilayer material based on glass-textolite with additional reinforcement, while the internal elements are made from aluminum alloys. Such a configuration may help reduce mass, simplify shaping, and provide sufficient stiffness for carriage, separation, and powered flight. However, the available data does not confirm that the S-71K itself is a low-observable missile, since radar cross-section would depend on geometry, inlet design, surface continuity, antennas, external protuberances, and carriage configuration. For the Su-57, the more immediate operational value is not necessarily stealthy missile penetration, but the ability to launch a powered weapon from a safer stand-off envelope.

Propulsion is provided by an R500 turbojet engine produced by Reynolds LLC, which HUR identifies as part of the United Aircraft Corporation. The missile’s estimated range of up to 300 km is enabled by a main fuel tank and two side fuel tanks. This places the S-71K closer to a compact air-launched cruise missile than to a glide bomb, since it can sustain powered flight after release and potentially approach a target from a route that differs from the carrier aircraft’s launch axis. This distinction matters for air-defense planning. A powered missile launched from tactical aviation can complicate threat geometry, especially if used alongside decoys, unmanned aerial vehicles, glide bombs, ballistic missiles, or other cruise missiles to stretch radar tracking capacity and interceptor allocation cycles.

The missile’s guidance and control architecture appears relatively simple but militarily relevant. HUR reports that the onboard flight-control system includes a flight controller, an inertial navigation system based on simple sensors, and a power-supply system. The War & Sanctions component listing identifies associated elements including the flight controller, air-pressure measurement module, accelerometer and gyroscope, battery management board, onboard power-supply voltage regulator, DC-DC converter, servo drives, air-intake device, rechargeable batteries, and the R500 turbojet engine. This points to a weapon optimized primarily for coordinate-based attacks against fixed or pre-surveyed targets rather than mobile targets requiring a sophisticated seeker, datalink correction, or autonomous terminal recognition.

The foreign electronic component base gives the S-71K disclosure strategic weight. HUR states that the majority of the missile’s electronics are of foreign origin, including components manufactured in the United States, China, Switzerland, Japan, Germany, Taiwan, and Ireland. The War & Sanctions portal lists 40 identified components associated with the S-71K and names manufacturers including Analog Devices, Infineon Technologies, Microchip Technology, Murata, ON Semiconductor, Renesas, STMicroelectronics, TDK, Texas Instruments, Vishay, Winbond Electronics, and others. For defense planners, this is not only a sanctions issue, but an operational one: access to dual-use electronics can shorten Russia’s development cycle by enabling flight control, power regulation, signal conversion, inertial measurement, and actuator management without requiring a fully domestic microelectronics base.

The possible future integration of the S-71K on the S-70 Okhotnik unmanned combat aerial vehicle is one of the most consequential elements of the disclosure. HUR states that Russia is considering the use of the missile from the S-70, which would move the weapon beyond a conventional fighter-launched profile and toward a distributed manned-unmanned strike architecture. If such integration is achieved, the Okhotnik could act as a forward missile carrier, allowing Russia to push a launch platform closer to defended airspace without exposing a pilot. In a wider Su-57/S-70 concept, the manned fighter could serve as a sensor, coordinator, or mission-control node, while the unmanned aircraft assumes a higher-risk launch profile and releases the missile from a more advantageous vector.

This would reflect a broader shift in Russian aviation warfare under the pressure of Ukrainian air defenses. Russia has increasingly relied on stand-off fires, glide bombs, long-range missile launches, unmanned systems, and saturation tactics to reduce the exposure of crewed aircraft near the front line. The S-71K fits this pattern but adds a new layer: a compact powered cruise missile developed for the Su-57 ecosystem and potentially adaptable to an unmanned combat aircraft. Instead of relying only on strategic bombers, ground-launched missiles, or tactical aircraft releasing glide bombs, Russia appears to be exploring a more flexible strike mix in which modern fighters, unmanned platforms, and air-launched cruise missiles generate multiple launch axes against defended targets.

The S-71K Kover represents more than the appearance of another Russian missile type. Its reported 300 km range, R500 turbojet engine, reinforced composite structure, OFAB-250-270 warhead, basic inertial navigation architecture, and dependence on foreign electronic components suggest a weapon designed around scalability, stand-off release, and platform integration rather than technological sophistication alone. For the Su-57, it offers a way to conduct strike missions while limiting exposure to dense air-defense zones. For the S-70 Okhotnik, if future integration is confirmed, it could support a more distributed model of unmanned forward missile employment. The HUR disclosure ultimately shows that countering this threat requires not only air-defense adaptation, but also deeper disruption of the industrial, electronic, and logistical networks that allow Russia to transform aviation platforms into new stand-off strike systems.

Written by Teoman S. Nicanci – Defense Analyst, Army Recognition Group

Teoman S. Nicanci holds degrees in Political Science, Comparative and International Politics, and International Relations and Diplomacy from leading Belgian universities, with research focused on Russian strategic behavior, defense technology, and modern warfare. He is a defense analyst at Army Recognition, specializing in the global defense industry, military armament, and emerging defense technologies.