Ukraine is set to mass-produce the Stone Cloak electronic warfare (EW) system after the United Kingdom authorized Kyiv to build the tablet-sized device locally. The decision marks a significant step in deepening defense-industrial cooperation between the two nations, allowing Ukraine to scale production of a technology that has proven critical in countering Russian guided munitions and drones.
What is Stone Cloak?
Stone Cloak is a compact electronic warfare system developed in the UK, designed primarily to suppress GPS-guided weapons and disrupt the navigation systems of drones and precision munitions. Unlike larger, vehicle-mounted EW systems, Stone Cloak is small enough to fit in a backpack or be mounted on a vehicle mast, making it highly versatile for frontline use. The system works by generating targeted radio frequency interference that confuses the GPS receivers of incoming threats, causing them to miss their targets or lose navigation entirely.
Its tablet-sized form factor is a key advantage. Traditional EW systems are often bulky, power-hungry, and require specialized operators. Stone Cloak, by contrast, is designed to be rugged, portable, and easy to deploy by infantry units, special forces, and vehicle crews. This portability enables rapid repositioning, which is crucial in modern warfare where electronic emissions can be triangulated and targeted.
UK licensing decision
The British government's decision to allow Ukraine to produce Stone Cloak domestically represents a notable shift in technology transfer policy. Instead of merely supplying the systems as finished products, the UK is now enabling Ukraine to build its own units, reducing dependence on foreign deliveries and shortening supply chains. This licensing arrangement also allows Ukrainian engineers to integrate Stone Cloak with other indigenous EW platforms and adapt it to the specific threats encountered on the battlefield.
According to defense sources, the approval came after months of negotiations and technical assessments to ensure that sensitive technology would be protected. The system's underlying software and design architecture are expected to be provided in a format that Ukrainian manufacturers can handle without compromising the UK's broader national security interests. This is a calculated risk that reflects the urgent operational need in Ukraine, as well as the trust built between the two militaries since 2022.
Mass production plans in Ukraine
Ukrainian defense officials have indicated that mass production will begin in the coming months, with several state-owned and private factories already preparing their assembly lines. The initial focus will be on producing enough units to equip frontline brigades, with a secondary aim of integrating the system onto drones and ground robots. Ukrainian manufacturers have gained considerable experience in rapid wartime production of electronic components, and Stone Cloak is well-suited to existing printed circuit board assembly lines.
The mass-production effort will also involve local sourcing of components wherever possible. While some specialized chips and antennas are still imported, the UK has provided a technical package that uses commercially available components to the greatest extent feasible. This reduces the risk of supply chain disruptions and allows Ukrainian industry to scale up quickly. Engineers are already working on improvements, including software-defined radio enhancements and automated frequency-hopping algorithms to stay ahead of Russian jamming.
Why Stone Cloak matters for Ukraine
Electronic warfare has become one of the defining domains of the conflict in Ukraine. Both sides use extensive EW systems to blind each other's drones, disrupt communications, and neutralize guided weapons. Russian forces have deployed sophisticated GPS jamming stations such as the RB-301B Borisoglebsk-2 and the Zhitel, which have caused Ukrainian precision munitions to miss targets and loitering munitions to lose their way. In response, Ukraine has sought Western EW systems that are resilient, portable, and resistant to Russian countermeasures.
Stone Cloak fills several gaps. Its small size allows it to be placed near the front lines, providing protective bubbles for infantry positions, artillery batteries, and command posts. Unlike larger systems, it can be hidden in residential areas or forests, making it difficult for Russian forces to detect and destroy. It also complements Ukraine's homegrown EW designs, which often lack the sophistication to defeat modern Russian frequency-hopping GPS.
Another critical advantage is interoperability. Stone Cloak has been designed to NATO standards, meaning it can be used alongside other Western-supplied systems and integrated into common operational data links. This allows Ukrainian units to share electronic intelligence and coordinate countermeasures more effectively. The device can also be updated with new software through a simple interface, enabling rapid adaptation to evolving enemy tactics.
Battlefield effectiveness
British sources have confirmed that Stone Cloak has already been used in combat in Ukraine, with early results exceeding expectations. The system has reportedly been effective against Russian Lancet loitering munitions and guided artillery shells such as the Krasnopol. By creating a localized GPS-denied zone, Stone Cloak forces Russian operators to rely on alternate guidance methods, many of which are less accurate or more susceptible to other countermeasures.
One of the most significant uses has been protecting critical logistics routes. Ukraine has deployed Stone Cloak near supply depots and jamming towers, creating corridors through which trucks and armored vehicles can move without being targeted by GPS-guided weapons. These corridors are not permanent; they can be relocated as the operational situation changes. This mobility has proven invaluable in a war characterized by rapid frontline shifts.
Drone warfare also benefits from Stone Cloak. Ukrainian drone operators face constant signal interference from Russian EW systems, particularly near the front line. While Stone Cloak itself is not a drone jamming system per se, it can be used in a paired configuration to create a safe channel for Ukrainian drones by suppressing GPS interference. Some units have improvised setups that combine Stone Cloak with directional antennas to both disrupt enemy drones and protect their own.
Broader implications for defense cooperation
The UK's decision to license production represents a broader trend in Western defense policy. Early in the war, Western nations were hesitant to provide advanced technology that could be captured or reverse-engineered by Russia. Over time, as Ukraine has demonstrated its ability to protect sensitive equipment and develop its own defense ecosystem, those restrictions have loosened. The production license for Stone Cloak follows similar agreements for domestic production of weapons and drones, including license-built artillery systems and loitering munitions.
For the UK, the arrangement strengthens its position as a leading defense partner to Ukraine and builds economic ties with Ukrainian industry. It also provides valuable operational feedback that helps British defense firms improve their systems. Data gathered from Stone Cloak use in real combat is fed back to UK engineers, allowing them to refine algorithms and hardware in ways that would be impossible without frontline exposure. This creates a mutually beneficial cycle of improvement.
Technical specifications and operation
While exact technical details remain classified, the Stone Cloak system is known to include a tablet-based control interface, a compact signal generator, and a power amplifier unit. The entire system can be operated via a ruggedized tablet using a graphical interface that displays local GPS threat zones, signal strength, and battery status. Operators can select from multiple jamming modes, including wide-area suppression, targeted spoofing, and adaptive nulling.
The system operates in the L1 and L2 GPS frequency bands, as well as the GLONASS and BeiDou frequencies used by Russian weapons. It can also be configured to jam other signals, such as the datalinks used by drone operators. The device is powered by a rechargeable lithium-ion battery pack that provides several hours of continuous operation, or it can be connected to a vehicle power supply. Its total weight is less than 5 kilograms, making it extremely portable by military standards.
Ukrainian technicians are being trained in servicing and advanced configuration, with a training center established at a secure location. The training course lasts two weeks and covers installation, calibration, fault diagnosis, and tactical deployment best practices. This local expertise will be instrumental when mass production begins, as it reduces the need for foreign contractors and enables rapid field support.
Future development and integration
Looking ahead, Ukraine plans to integrate Stone Cloak with its own electronic warfare platforms, including the Bukovel-AD and the Anti-Dronus systems. By combining these different capabilities, Ukrainian forces can create layered defenses that cover a broader spectrum of threats, from GPS-guided bombs to FPV drones. Software integration will allow a single operator to control multiple systems from a centralized command interface.
There are also discussions about mounting Stone Cloak on unmanned ground vehicles (UGVs) and loitering munitions to create moving jamming platforms. This would enable forces to create an EW shield around an advancing column or to place a jammer at a high elevation for better coverage. British engineers have expressed support for these efforts, as they align with the UK's own research into autonomous EW systems.
For the Ukrainian defense industry, the Stone Cloak license is a vote of confidence. It demonstrates that Ukraine is not merely a consumer of foreign military aid but a capable producer of advanced technology. The skills and infrastructure developed for Stone Cloak production can be repurposed for other electronics projects, potentially opening the door for future licensed production of radar systems, communications jammers, and signal intelligence equipment.
Challenges and risks
Mass production is not without challenges. Ukrainian factories continue to face the threat of Russian missile strikes, which have previously targeted defense plants. To mitigate this, production lines are being dispersed across multiple locations, with critical components fabricated in smaller workshops that are harder to locate and destroy. The use of mobile production units mounted on trucks is also being explored, allowing the manufacturing process to be relocated on short notice.
Another challenge is the supply of electronic components, particularly high-frequency transistors and custom antennas. While the UK has facilitated access to these components, global supply chain bottlenecks and export controls could cause delays. Ukraine is therefore investing in local manufacturing of passive components and developing alternative suppliers in friendly nations. This effort aligns with the broader NATO goal of reducing dependency on less reliable sources.
There is also the risk that Russian forces will eventually develop countermeasures to Stone Cloak. In the arms race of electronic warfare, jammers and anti-jammers constantly evolve. The UK and Ukraine are aware of this, and the system's software-dependent architecture allows for rapid updates. Ukrainian field units can report new Russian tactics, and updated jamming algorithms can be distributed to all units via secure networks within days.
Operational scenarios and tactics
Ukrainian soldiers have developed innovative tactics around Stone Cloak. One common approach is the 'guerrilla jam,' in which a small team moves to a location near the front line, activates the system for a short period to disrupt an imminent Russian strike, and then relocates before Russian reconnaissance can pinpoint the source. This hit-and-run tactic leverages the device's portability and quick setup time.
Another tactic involves pairing Stone Cloak with decoy emitters. The decoys broadcast signals that mimic the Stone Cloak's frequency profile, attracting anti-radiation missiles and jamming-seeking drones. The real system remains hidden and continues to operate. This has proven effective in protecting high-value positions such as artillery batteries and command centers.
The system is also used in defensive counter-drone operations. When a suspected Russian FPV drone is detected approaching a position, the operator activates Stone Cloak to disrupt its GPS and video link. In many cases, the drone crashes or veers off course. This provides an inexpensive and effective layer of defense that does not require expensive air-defense missiles or dedicated gun systems.
Recording the Ukrainian production experience
The significance of this UK-to-Ukraine technology transfer extends beyond the immediate military benefits. It serves as a model for how Western nations can support Ukraine's defense industrial base in a sustainable, long-term manner. Building weapons and systems inside Ukraine reduces the recurring costs of foreign aid, shortens delivery times, and ensures that maintenance and upgrades are handled by local engineers who understand the war's daily realities.
It also sends a diplomatic signal to other partners. Countries like Germany, France, and the United States are watching the Stone Cloak arrangement closely as they consider similar licensing deals for their own equipment. If the program succeeds, it could pave the way for licensed production of other advanced systems, including air-defense radars, electronic support measures, and secure communications equipment. The Ukrainian defense industry is eager to take on these projects, and the Stone Cloak production line will be its living proof of capability.
With mass production expected to ramp up in the coming months, Ukraine will soon field hundreds of Stone Cloak units across its armed forces. Each one represents not only a piece of advanced technology but also a symbol of the defense partnership that has kept Ukraine's cause alive in the face of overwhelming odds. The device may be tablet-sized, but its impact will be felt across the entire battlefield.
Source: TechRadar News