Estonia and Latvia reported foreign drone activity near their borders with Russia overnight, the latest in a series of incidents raising concern about airspace security and the risk of spillover from the war in Ukraine.

Estonia and Latvia said they detected foreign drone activity near their borders with Russia overnight, in the latest airspace incident to unsettle NATO’s eastern flank and underline the growing security risks around the Baltic region. Reuters reported on Tuesday, 31 March, that both countries had identified unmanned aircraft activity close to their territory, with Estonia issuing a preventive threat notification before the risk passed.

Estonia’s defence forces said they had detected what they described as “potentially dangerous air activity” inside and outside Estonian airspace during the night. Reuters, citing Estonian public broadcaster ERR, reported that debris from at least one drone was found in Tartu county, while further findings were being investigated. Colonel Uku Arold, a spokesperson for Estonia’s defence forces, told ERR that it was “highly likely” that Ukrainian drones that had gone astray were involved. Latvian authorities said separately that they had detected a foreign unmanned aerial vehicle near the Latvian-Russian border late on Monday, but that it had not entered Latvian airspace.

The incidents come less than a week after Reuters reported that stray Ukrainian drones had entered the airspace of both Estonia and Latvia, with one drone striking the chimney of Estonia’s Auvere power station and another crash-landing in Latvia. Those earlier incursions were considered unintended and likely linked to a broader Ukrainian attack on Russian oil infrastructure. No major casualties were reported, but the events added to concern in the Baltic states that the war’s aerial dimension is creating new risks for neighbouring NATO members.

Russian drone strikes chimney of Estonian power station after crossing from Russian airspace

The wider context is Ukraine’s recent intensification of drone strikes on Russian oil refineries and export infrastructure. Kyiv has stepped up attacks on Russian energy targets in recent weeks, including sites close to Russia’s border with the Baltic states and Finland, in an effort to weaken Moscow’s war economy. That campaign increases the likelihood that drones, debris or electronic interference could affect nearby NATO territory even when Alliance states are not the intended target.

From a defence perspective, the significance of the latest incident lies in what it says about the operating environment on NATO’s north-eastern edge. NATO states on the eastern flank are already dealing with a mix of conventional deterrence requirements, sabotage risks, cyber pressure and repeated airspace incidents. NATO says its integrated air and missile defence system is designed to protect Allies from airborne threats including drones, and that permanent NATO air policing operates around the clock. The Alliance also says it launched Eastern Sentry in September 2025 to increase vigilance along the eastern flank, while NATO AWACS aircraft have conducted hundreds of surveillance flights over the Baltic and Black Sea regions since Russia’s full-scale invasion of Ukraine.

NATO’s own description of the eastern-flank posture shows why even apparently limited drone incidents are treated seriously. The Alliance says it is strengthening air and missile defence, expanding surveillance and intelligence-sharing, and improving rapid reinforcement plans for eastern member states. It also states that Allies have experienced increasing hostile actions including cyber attacks, sabotage and airspace violations by fighter jets and drones. In that context, each new incident feeds into a broader assessment of readiness, attribution and response thresholds.

For Estonia and Latvia, the immediate issue is not only whether a specific drone crossed a border, but whether national and Alliance systems can detect, track and assess such activity quickly enough. The challenge is operational as well as political. If the incident is accidental, governments must avoid overreaction while still demonstrating control of national airspace. If it reflects a pattern of unsafe military activity near NATO territory, it becomes part of a wider deterrence problem requiring visible Alliance attention.

There is, at present, no indication from the reporting that Estonia or Latvia were deliberately targeted. Reuters’ account points instead to the probability of drones connected to Ukrainian operations going astray. Even so, the repeated appearance of unmanned systems in or near Baltic airspace is likely to reinforce calls for stronger local surveillance, better cross-border coordination and continued NATO emphasis on air defence and early warning in the region.

The latest episode therefore matters less as an isolated border incident than as evidence of how the Ukraine war is affecting the security environment of neighbouring NATO states. On the eastern flank, the distinction between direct threat and operational spillover is becoming harder to manage in practice. That is why even brief or ambiguous drone activity is now treated as a matter of Alliance readiness rather than a purely local event.