A growing number of drone incursions, sabotage incidents and other suspected Russian operations across Europe are raising questions about NATO’s response threshold and the continent’s ability to coordinate its defence.
Europe is facing a widening campaign of suspected Russian hybrid activity, with incidents ranging from drone incursions and sabotage to attacks on transport and infrastructure. While individual cases remain difficult to attribute, European officials and security analysts say the growing pattern is testing the limits of the continent’s existing security arrangements.
The developments come as European governments continue to support Ukraine and debate how to respond to a more confrontational security environment, while uncertainty over the future role of the United States in European defence has added another layer to the debate.
A growing pattern of incidents
In recent months, European countries have reported a series of incidents linked, or in some cases suspected of being linked, to Russia.
Italian fighter jets operating on a NATO mission shot down an explosives-laden drone that entered Lithuanian airspace from Belarus, while NATO aircraft were also scrambled after Russian fighter jets entered NATO airspace. Russian drones struck a train in Ukraine near the Polish border, while German authorities have blamed Russia for an explosives-laden drone that was flown into a cargo aircraft used to transport weapons for Ukraine at Leipzig-Halle airport in August.
Other incidents have involved suspected sabotage of transport infrastructure, cyber operations, arson and attempts to target defence-related companies.
Not every incident has been conclusively attributed to Moscow. That uncertainty is itself a feature of what European security officials describe as grey-zone or hybrid activity: operations designed to cause disruption while remaining below the threshold that would clearly trigger a military response.
Analysts say the suspected campaign has several objectives, including raising the cost of European support for Ukraine, disrupting critical infrastructure and testing the political cohesion of NATO members.
Testing NATO’s response threshold
The central challenge for European governments is determining when individual incidents become a collective security issue.
Article 5 of the NATO treaty commits members to treat an armed attack against one ally as an attack against all, but hybrid operations often occupy a deliberately ambiguous space between criminal activity, sabotage and military aggression.
Polish Prime Minister Donald Tusk has warned that Russia could seek to exploit this ambiguity by carrying out attacks that could be presented as accidental, while French President Emmanuel Macron has also briefed political leaders about the possibility of civilian casualties linked to the wider threat.
Security analysts argue that Moscow could benefit from uncertainty even when responsibility for an individual incident cannot be established. The lack of a clear attribution can make it harder for European governments to agree on a coordinated response.
That does not mean every incident is part of a single centrally directed campaign. European authorities continue to investigate individual cases, and some remain unresolved.
Europe’s wider security dilemma
The issue has become more complicated because of questions surrounding the future role of the United States in European security.
NATO remains the continent’s principal collective defence framework, but European governments are increasingly discussing whether they need additional mechanisms that could operate if Washington were unwilling to become directly involved in a particular crisis.
European Commission President Ursula von der Leyen has proposed a mechanism for responding collectively to hybrid attacks, including measures related to medical support, evacuation, energy security, military mobility and economic pressure. She has also backed discussions around a European security council involving countries willing and able to contribute to European defence.
Such proposals face significant political and institutional obstacles. EU governments retain primary responsibility for national security and defence, while NATO already provides an established military framework. Reaching rapid agreement among a large group of countries could also prove difficult during a fast-moving crisis.
The discussion nonetheless reflects a broader concern: Europe may need to strengthen its ability to respond to actions that fall below the threshold of conventional warfare.
From isolated incidents to sustained pressure
European governments are already increasing protection around critical infrastructure, including airports and other facilities vulnerable to drones. Some security officials have also called for stronger collective measures, ranging from diplomatic expulsions and sanctions to tighter restrictions on Russian activities in Europe.
The immediate concern is that individual incidents could become more serious. A drone entering restricted airspace, for example, may create disruption without causing casualties, while sabotage on a railway or attack on an airport could potentially have far more severe consequences.
At the same time, European governments face the challenge of responding without allowing every unexplained incident to become the trigger for a wider confrontation.
The emerging security environment is therefore less about a single dramatic attack than about sustained pressure over time. The concern among European officials and analysts is that repeated low-level incidents could gradually test political cohesion, increase the costs of supporting Ukraine and expose differences over how far individual countries are prepared to go in confronting Russia.
For Europe, the immediate task is to improve attribution, protect vulnerable infrastructure and establish clearer mechanisms for collective responses before an individual incident forces governments to make decisions under far greater pressure.
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