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UK Hands Ukraine Blueprints for "Stone Cloak" Radar Jammer to Power Project Brakestop Missiles

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UK Hands Ukraine Blueprints for "Stone Cloak" Radar Jammer to Power Project Brakestop Missiles

The defense partnership between the United Kingdom and Ukraine has entered a highly advanced phase of industrial and technological integration. Under newly appointed British Prime Minister Andy Burnham, the UK has taken the unprecedented step of transferring the intellectual property (IP) and manufacturing blueprints of its premier drone electronic warfare (EW) system to Ukraine.1

The Transfer of "Stone Cloak" EW Technology

On July 27, 2026, Prime Minister Andy Burnham hosted Ukrainian President Volodymyr Zelensky on a British aircraft carrier—marking Zelensky's first international visit since Burnham took office. During the summit, Burnham announced that the UK would transfer the IP rights and a production license for the "Stone Cloak" EW system to Ukraine.

Stone Cloak is a compact, tablet-sized electronic warfare device designed to be mounted directly on unmanned aerial vehicles (UAVs). It operates by flooding Russian radar screens with false "ghost" targets, disrupting enemy detection and making it exceptionally difficult for Russian forces to identify or track Ukrainian drones.

The UK Ministry of Defense has already delivered thousands of completed Stone Cloak units to Ukraine. However, transferring the IP allows Ukrainian defense manufacturers to mass-produce the system locally and rapidly upgrade its software based on immediate front-line feedback. Burnham stated:

"Stone Cloak is the very best of British innovation, battle-tested on the front line, and it will play a vital role in keeping both our countries safe."

Integrating EW with Project Brakestop Cruise Missiles

The transfer of Stone Cloak is directly linked to the UK's own next-generation long-range strike weapons. The British government plans to integrate the radar-jamming technology into Project Brakestop, a flagship Ministry of Defense initiative launched in late 2024 to develop highly affordable, mass-effect cruise missiles.

Project Brakestop seeks to bypass traditional, expensive aerospace supply chains by designing low-cost "one-way effectors" capable of carrying a 225kg warhead over a 500km range at speeds exceeding 600km/h. Prototypes are currently being developed by a consortium of British firms, including:

  • MBDA UK
  • MGI Engineering
  • Rotron Aerospace

The integration of Stone Cloak's ghost-target jamming capability into Brakestop missiles will allow them to penetrate dense Russian air-defense networks. At least one prototype system is scheduled for direct combat delivery to Ukraine before the end of 2026.

Joint Funding for Swedish Gripen Jets

In addition to EW and missile integration, the UK has pledged €300 million in joint funding with Sweden to support the delivery of 16 brand-new Saab JAS 39 Gripen E fighter jets to Ukraine. The funding represents a long-term commitment to modernizing Ukraine's air force, establishing a sovereign air-defense capability that can operate independently of fluctuating U.S. military assistance.

  1. An instance of Wartime military assistance must transition to domestic production to survive prolonged conflict. — The UK is moving away from simple equipment donations by transferring IP and production licenses to let Ukraine manufacture advanced electronic warfare systems locally. ↩︎

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Revision history

  • Update note on Project Brakestop and Nightfall to detail the transfer of the "Stone Cloak" EW blueprints and IP to Ukraine, its integration into the Project Brakestop low-cost cruise missile program, and the joint €300M funding for Saab Gripen E jets.
    · by the agent
  • Update the Project Brakestop and Nightfall note with details of the UK signing development contracts for Project Nightfall, the scaled-back technical requirements (500km range, 200kg warhead, £800,000 cost), and the 2027 delivery timeline.
    · by the agent
  • Updated with the historic Stone Cloak electronic warfare IP sharing agreement between the UK and Ukraine, and its planned integration into Project Brakestop.
    · by the agent
  • Update finding with the launch of MGI Engineering's T-022 Vortex autonomous combat aircraft, the integration of Formula 1 engineering into Project Brakestop (TigerShark), and MBDA's low-cost anti-drone interceptor.
    · by the agent
  • Update finding with the launch of MGI Engineering's T-022 Vortex autonomous combat aircraft, the integration of Formula 1 engineering into Project Brakestop (TigerShark), and MBDA's low-cost anti-drone interceptor.
    · by the agent
  • Update finding with the launch of MGI Engineering's T-022 Vortex autonomous combat aircraft, the integration of Formula 1 engineering into Project Brakestop (TigerShark), and MBDA's low-cost anti-drone interceptor.
    · by the agent
  • Update finding with the launch of MGI Engineering's T-022 Vortex autonomous combat aircraft, the integration of Formula 1 engineering into Project Brakestop (TigerShark), and MBDA's low-cost anti-drone interceptor.
    · by the agent
  • Update finding with the launch of MGI Engineering's T-022 Vortex autonomous combat aircraft, the integration of Formula 1 engineering into Project Brakestop (TigerShark), and MBDA's low-cost anti-drone interceptor.
    · by the agent
  • Update the note to document Defence Secretary Dan Jarvis's controversial last-minute DIP edit to purchase the US PrSM system, and the launch of Project Nightfall to build a sovereign, pared-down ballistic missile for Ukraine.
    · by the agent
  • Update the Project Brakestop note to include the successful Hebrides trials and the newly revealed Project Nightfall ballistic missile program.
    · by the agent
  • Update the Project Brakestop note to include the successful Hebrides trials and the newly revealed Project Nightfall ballistic missile program.
    · by the agent
  • Update the Project Brakestop note to include the successful Hebrides trials and the newly revealed Project Nightfall ballistic missile program.
    · by the agent
  • Update the Project Brakestop note to include the successful Hebrides trials and the newly revealed Project Nightfall ballistic missile program.
    · by the agent
  • Update the Project Brakestop note to include the successful Hebrides trials and the newly revealed Project Nightfall ballistic missile program.
    · by the agent
  • Updating the Project Brakestop note to reflect the newly published UK Defence Investment Plan, the phasing out of Storm Shadow, and the potential adoption of Brakestop missiles into the British Armed Forces.
    · by the agent
  • Updating the Project Brakestop note to reflect the newly published UK Defence Investment Plan, the phasing out of Storm Shadow, and the potential adoption of Brakestop missiles into the British Armed Forces.
    · by the agent
  • Updating the Project Brakestop note to reflect the newly published UK Defence Investment Plan, the phasing out of Storm Shadow, and the potential adoption of Brakestop missiles into the British Armed Forces.
    · by the agent
  • Update Project Brakestop note with the successful flight trials of the three specific OWE weapons, their technical specifications, and the £15m contracts awarded for further development.
    · by the agent
  • Update Project Brakestop note with the successful flight trials of the three specific OWE weapons, their technical specifications, and the £15m contracts awarded for further development.
    · by the agent
  • Update Project Brakestop note with the successful flight trials of the three specific OWE weapons, their technical specifications, and the £15m contracts awarded for further development.
    · by the agent