War of the Shadow Fleet: IISS Report Exposes Russia's Drone Reconnaissance Campaign Over Europe

War of the Shadow Fleet: IISS Report Exposes Russia's Drone Reconnaissance Campaign Over Europe

On July 2, the International Institute for Strategic Studies (IISS), in partnership with the Hanns Seidel Foundation, published a report titled Russia's UAV Campaign Over Europe. Authors Charlie Edwards, Rex Fox O'Loughlin, and Louis Bearn document how Russia, between August 2024 and February 2026, used shadow fleet vessels as launch and recovery platforms to conduct a deniable drone reconnaissance campaign across Europe.

To support their findings, the research team built a dataset of 144 incidents using the Armed Conflict Location and Event Data Project (ACLED), supplemented by open-source intelligence, AIS/SAR maritime tracking, and interviews with European defense officials. All 144 drone incidents were found to have links to Russian shadow fleet vessels.

The report's conclusions are alarming: Europe's existing air defense architecture is fundamentally ill-equipped to stop such operations. Below are the report's core findings and their implications.

Key Takeaways

The Maritime-Aerial Seam Is the Defensive Vulnerability

Conventional land-border air defense systems are designed to detect threats crossing territorial boundaries. In this campaign, however, drones were launched from vessels loitering in international waters or exclusive economic zones (EEZs), exploiting gaps in AIS signals, GNSS spoofing, and the cover of flags of convenience to maintain persistent ambiguity over attribution. Across the entire dataset, only the Zhigulevsk–Charles de Gaulle incident — in which a Russian drone launched from the former was intercepted en route to the latter — provided relatively clear attribution. The ambiguity in every other case was by design.

Aerial Incursions Are Fundamentally a 'Reconnaissance by Action' Tactic

Every European intercept, scrambled fighter jet, or activated jammer feeds Moscow with intelligence on response times and rules of engagement. For Russia, even when an operation falls short of its immediate objective, the intelligence gathered constitutes a success in its own right.

Attribution Paralysis Is an Operational Outcome

No European government has formally attributed any incident to Russia. That hesitation, repeated across more than a dozen uncoordinated nations, is precisely the defensive gap this campaign was designed to expose.

Legal Authorities Are Outpaced by Operational Realities

Germany authorizes only law enforcement — not the military — to shoot down drones, while Poland and Romania operate under more permissive frameworks. This conspicuous intra-alliance divergence has been amplified and exploited by Russian information operations.

Cost Asymmetry Favors the Attacker

Using low-cost drones to exhaust expensive interceptor resources is a lesson validated on the Ukrainian battlefield — and it is now playing out on NATO's home territory. The European Drone Defense Initiative (EDDI) is unlikely to close this gap before 2027.

Conclusion

The report's central recommendation is clear: maritime domain awareness and airspace defense must be treated as a single, unified problem. As long as shadow fleet vessels can loiter and launch drones with near impunity, any investment in land-based counter-drone weaponry will address only half of the threat.

This is a complex, cross-domain, cross-border challenge. As the report notes, the capability to attribute incursion operations does exist, and there are documented cases of success. For Europe, the real question is whether governments are prepared to act — to cross regulatory and political barriers and forge a genuine collective response.

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