When Andy Burnham Stone Cloak announced during his first meeting with Volodymyr Zelensky, many had the impression that the UK was handing Ukraine new military technology. In reality, Stone Cloak was already operational. The news concerns the granting of the license that will allow Kiev to independently produce this electronic warfare system.
Let’s start with a clarification, because the name easily lends itself to misunderstandings. Stone Cloak protects neither cities nor infrastructure and has nothing to do with an anti-missile system; rather, it is a device, a small jammer mounted on Ukrainian drones that serves to confuse the enemy’s sensors and electronic systems, emitting signals during flight that disrupt Russian air defenses. In short, Stone Cloak makes it more difficult to locate the drone, follow its path and, ultimately, shoot it down.
Why it matters
To understand why Stone Cloak is so important we must start from the fact that the war in Ukraine it has become above all electronic warfare. For about a year, Kiev has moved much of the conflict away from the front line, aiming to undermine Russia’s ability to sustain the war by destroying refineries, warehouses, energy infrastructure, military airports and weapons industry plants. To do this successfully, however, it not only needs drones capable of traveling hundreds or thousands of kilometers, but also to be able to arrive at their destination without being intercepted. This is where a decisive part of the conflict takes place. Each new offensive capability quickly generates a countermeasure that, in turn, drives the development of new technology to circumvent it. Stone Cloak fits into this competition. It does not increase the destructive capacity of the drone, but the chances that it will be able to overcome Russian defenses and reach the target even by traveling thousands of kilometers in Russian airspace.
In recent months, Ukraine has managed to effectively strike targets located in the heart of Russian territory. Many of these attacks were conducted with drones equipped with British electronic warfare systems. Stone Cloak, therefore, is not a technology that will enter the battlefield today. It was already present, already operational and already used in the Ukrainian missions, and their success is there for all to see.
What changes now?
To answer you have to go back more than a year. In January 2025 Keir Starmer and Volodymyr Zelensky signed the so-called 100-year partnership agreementa strategic partnership set to transform military cooperation between London and Kiev. In the following months a specific agreement on combat technologies followed, the birth of joint programs such as Lyra, Octopus And Nightfalland finally the first UK–Ukraine strategic dialoguewhich consolidated collaboration in the development of drones, electronic warfare and the defense industry. In parallel, the British Ministry of Defense accelerated Project brakestopthe program to develop a new generation of low-cost, long-range strike systems, designed for Ukraine but also intended to strengthen the future capabilities of the British Armed Forces. Finally, a few days before leaving Downing Street, Starmer took a further step, ensuring British companies access to contracts financed by the European program Ukraine support loanlinking military support to Kiev even more closely with the development of the UK’s defense industry.
It is within this program that Stone cloak was born. When Burnham enters Downing Street, the system is no longer an experimental project: it has been developed by British industry, produced in thousands, delivered to Ukraine, used in combat and tested in the field. The news announced by the new prime minister concerns another aspect. Burnham did not deliver Stone Cloak to Kiev; instead it authorized the sharing of intellectual property to allow Ukrainian industry to independently produce the system on a large scale.
This is an important step that changes the relationship between London and Kiev. As long as Stone cloak was produced in the UK, Ukraine was dependent on British production capacity, delivery times and the political decisions of the government of the day. With the transfer of intellectual property, the system instead becomes part of the Ukrainian defense industry.
For a country engaged in a war of attrition this represents a crucial step. It means being able to increase production, adapt the device to the different drone models developed by the national industry and reduce dependence on Western supplies.
Why does London give away such advanced technology
At first glance the decision may appear surprising. Why share advanced military technology instead of retaining control? The answer is that Stone cloak represents not only help to Ukraine, but also an investment in Britain’s future defense capabilities.
The cooperation model built over the last two years is in fact based on continuous exchange. British industry develops new technologies, Ukraine uses them in combat in an operational context unique in the world and the experience gained in the field returns to the designers in the form of data, performance and countermeasures identified during real use. Each mission thus contributes to improving the next generation of British systems.
This is the logic that also underlies Stone cloak. Allowing Ukraine to produce it directly means accelerating its evolution, increasing the number of systems available and the speed with which they can be updated. At the same time, the UK continues to benefit from intelligence gathered on the battlefield, turning Ukrainian operational experience into technological innovation.
Collaboration between British industry and Ukrainian innovation
Authorizing the transfer of Stone cloak’s technology and intellectual property represents an important step. Burnham’s decision in fact expands the cooperation model built over the last two years, moving it from sharing capabilities to sharing their production.
It is the continuation of the direction set by the Starmer government, which had made the collaboration between British industry and Ukrainian innovation one of the pillars of the relationship between the two countries. The Stone cloak license adds a further layer to that strategy, strengthening its continuity and confirming its evolution.
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