Sources and method
Every fact in this briefing traces to a public source. The full list is below, grouped the way the Causal Nexus deep dive groups it, with the original PDF.
How this briefing was made
Causal Nexus starts from a question, collects the evidence and keeps every claim linked to its source. A separate check reviews whether each claim is supported, and the numbers are recalculated before anything is published. The analysis explains mechanisms and consequences. It is interpretation, and it is for information only.
All 23 sources
RFE/RL: Explosive-laden drone shot down over Lithuania (15 Sep 2026)
Bloomberg: NATO shoots down drone that entered Lithuanian airspace (15 Sep 2026)
Breaking Defense: EU chief calls for new hybrid response protocol (16 Sep 2026)
AP via KSAT: Von der Leyen calls for EU security mechanism (16 Sep 2026)
CNN: Germany blames Russia for drone attack on Leipzig airport (1 Sep 2026)
Defense News: German government blames Russia for Leipzig airport drone attack (2 Sep 2026)
Al Jazeera: Germany accuses Russia of failed drone attack on Leipzig airport (1 Sep 2026)
TVP World: IISS says Russia used shadow fleet in drone campaign (2 Jul 2026)
ABC News / AP: Russia waged drone campaign over Europe (2 Jul 2026)
ECFR: Buzzkill, how to defend Europe against drones (18 Aug 2026)
European Commission: Action Plan on Drone and Counter-Drone Security (11 Feb 2026)
DroneXL: Germany shoot down Russian drone threat (1 Mar 2026)
Inside Unmanned Systems: Europe must upgrade its counter-drone strategy now
Unmanned Airspace: IISS report on Russia's drone campaign against Europe
AeroTime: Drone threat to Europe's infrastructure is surging (25 May 2026)
European Parliament Research Service: Drones and new systems of warfare782599_EN.pdf)
Al Jazeera: Can the EU's Article 42.7 offer NATO-like collective defence? (30 Apr 2026)
Grosswald.org: Von der Leyen proposes a European Article 4 (16 Sep 2026)
TechTimes: Same veto that froze Russia sanctions governs the counter-hybrid playbook (17 Sep 2026)
ECFR: From shield to sword, Europe's offensive strategy for the hybrid age
Further reading
UAV-Defence: The EU Counter-UAS Action Plan explained for security buyers (1 Jun 2026)
Bird & Bird: European Commission Counter-UAS Action Plan (25 Mar 2026)
ABJ Drone Academy: Europe is tightening drone identification rules (21 Sep 2026)
France24: NATO fighter jets shoot down drone over Lithuania (15 Sep 2026)

