Copenhagen Sounds the Alarm on Russian Hybrid Threats

Denmark’s intelligence service has issued a stark warning that Russia is expected to step up hybrid warfare operations over the coming months. The assessment points toward a heightened period of covert pressure, ranging from cyber disruptions and disinformation campaigns to physical sabotage targeting critical infrastructure. While European capitals have lived under the shadow of sub-threshold harassment for years, the Danish alert suggests Moscow may be preparing a renewed offensive in the strategic gray zone that sits just below the line of overt military conflict.

Hybrid tactics are designed to exploit the vulnerabilities of open democratic societies without triggering mutual defense obligations like NATO’s Article 5 or the EU’s mutual assistance clause (Article 42.7 of the EU Treaty). For citizens across Europe, an escalation in hybrid activity rarely arrives as a marching army. Instead, it manifests in frustratingly mundane ways: compromised transport networks, sudden disruptions to energy or communications systems, tampered undersea cables, or targeted digital disinformation aimed at stoking domestic political friction. Public intelligence warnings serve to alert critical infrastructure operators while signalling to hostile actors that their covert playbooks are already recognized.

In the halls of the European Commission and NATO headquarters, hybrid warfare is the ultimate administrative challenge. Because gray-zone attacks intentionally blur the line between ordinary cybercrime, state-sponsored aggression, and accidental infrastructure failure, determining which authority responds—and under what legal mandate—requires endless coordination. The EU relies on specialized bodies like the Hybrid Fusion Cell within the European External Action Service (the diplomatic arm of the EU) to gather and analyze threat intelligence shared by member states. However, national security remains strictly a national competence. Denmark can brief its European partners, but aligning 27 national capitals with differing risk tolerances and legal procedures remains a complex diplomatic exercise.

The assessment from Copenhagen will be fed into shared European and NATO intelligence channels. Denmark and neighboring Baltic Sea nations are expected to increase monitoring around vulnerable maritime and energy infrastructure in the coming months. Meanwhile, EU security committees will continue working to streamline joint response protocols for sub-threshold attacks ahead of the anticipated increase in activity.