Finnish Defense Forces Close Helsinki Airport as Russian Jamming Diverts Ukrainian Drones

At 4am on May 15, Helsinki Airport went dark. Finnish Hornets took off over Uusimaa, the region around the capital, cell broadcast alerts reached 1.8 million phones, and residents were told to stay indoors. Hours earlier, Ukraine had warned through classified NATO channels that its combat drones, launched against Russian targets, could be pushed into Finnish airspace by Russian electronic warfare. Three hours later, the airport reopened. Finnish defence forces found no confirmed airspace violations. The alarm was false, but the gap it exposed was real.

Four Countries, Four Improvisations

In the same week, Latvia issued regional cell broadcast warnings after three Ukrainian drones entered its airspace on May 7, two of them crashing near Rēzekne, with one hitting empty oil tanks. Estonia sent local alerts only to Võru and Ida-Viru counties, then withdrew them within hours. Poland scrambled jets and raised ground-based air defences, but gave the public no warning.

Each government could defend its decision. Taken together, the decisions show a NATO problem that matters also to small states: there is no common procedure for an ally’s drone drifting into allied airspace. NATO targeting doctrine recognises hostile and friendly objects. A Ukrainian drone diverted by Russian jamming falls between the two. And because NATO rules of engagement do not apply to national armed forces operating on their own territory, each country is left to decide alone.

The Warning System That Wasn't Ready

Finland’s 112 Suomi app, used by roughly two million people, failed at the moment it mattered. The first danger alert arrived. The "all clear" message did not reach many users for one to two hours, because the app needs an internet connection to update. Cell broadcast, the EU-mandated system that sends alerts directly through mobile towers without requiring an app, was meant to be operating across all member states by June 2022 under the European Electronic Communications Code. Finland is six years late. The system will not be ready until late 2027.

Germany introduced cell broadcast after the 2021 Ahrtal flood disaster and now reaches 97% of its population through at least one warning channel. Latvia used cell broadcast on May 7, but residents in Rēzekne received warnings 70 minutes after the drone had already crashed. The EU can impose a deadline. It cannot make national systems work on time.

Political Fallout Follows Geography

Latvia’s Prime Minister Evika Siliņa resigned on May 14 after dismissing her defence minister without consulting his party, bringing down the governing coalition. The drone incidents triggered the clash, but the real weakness was coalition discipline, exposed under pressure (la.lv, Le Monde). In Estonia, Defence Minister Hanno Pevkur publicly demanded that Ukraine install "kill switches", automatic self-destruct mechanisms that destroy drones when they leave their programmed course. Finland’s message was sharper: Defence Minister Häkkänen told Kyiv that using Finnish airspace "is strictly forbidden. Absolutely forbidden".

Ukraine’s Foreign Minister Sybiha blamed all deviations on deliberate Russian electronic warfare and offered to send security experts to Baltic capitals.

Racing to Close the Gap

The hardware response is moving quickly. Rheinmetall and Deutsche Telekom announced a joint civilian drone-shield project four days before the Helsinki alarm, using mobile towers as passive radar sensors. NATO began counter-drone tests in Romania under Operation Eastern Sentry. The Bucharest Nine, a group of nine eastern-flank NATO members, called for consolidated air defence at their May summit.

These projects deal with detection and interception. They do not settle the harder doctrine question: when an allied drone crosses your border, who decides what it is, and what follows? NATO’s emerging European Drone Defence Initiative aims for full operational capacity by 2027-2028, but it is built around hostile drones, not the ambiguous third category that four countries have already faced this month. The next incident may not end in an empty field.