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

At 4 a.m. on May 15, Helsinki Airport went dark. Finnish Hornets scrambled over Uusimaa, cell broadcast alerts lit up 1.8 million phones, and residents were told to shelter indoors. Hours earlier, Ukraine had warned through classified NATO channels that its combat drones, launched against Russian targets, might be diverted into Finnish airspace by Russian electronic warfare. Three hours later, the airport reopened. Finnish defence forces found no confirmed airspace violations. The incident itself was a false alarm. The institutional blind spot it exposed was not.

Four Countries, Four Improvisations

That same week, Latvia issued regional cell broadcast warnings after three Ukrainian drones entered its airspace on May 7, two crashing near Rēzekne, one hitting empty oil tanks. Estonia sent localised alerts only to Võru and Ida-Viru counties, then cancelled them within hours. Poland scrambled jets and raised ground-based air defences but told the public nothing.

Each government made a defensible choice. Together, the choices reveal a gap: NATO has no shared procedure for handling an ally's drone that strays into allied airspace. The alliance's targeting doctrine sorts objects into two categories, hostile or friendly. A Ukrainian drone diverted by Russian jamming fits neither. And NATO's rules of engagement do not apply to national armed forces operating on their own soil, so each country improvises alone.

The Warning System That Wasn't Ready

Finland's 112 Suomi app, relied on by roughly two million users, failed at the critical moment. The initial danger alert went through. The "all clear" message did not reach many users for one to two hours because the app requires an internet connection to update. Cell broadcast, the EU-mandated system that pushes alerts directly through mobile towers without needing any app, was supposed to be operational across all member states by June 2022 under the European Electronic Communications Code. Finland is six years late. The system won't be ready until late 2027.

Germany, which deployed cell broadcast after the 2021 Ahrtal flood disaster, now reaches 97% of its population through at least one warning channel. Latvia used cell broadcast on May 7, yet residents in Rēzekne received warnings 70 minutes after the drone had already crashed. The EU can set deadlines. It cannot force countries to meet them.

Political Fallout Follows Geography

Latvia's Prime Minister Evika Siliņa resigned on May 14 after unilaterally firing her defence minister without consulting his party, collapsing the governing coalition. The drone incidents triggered the confrontation, but the underlying cause was a fracture in coalition discipline that the crisis forced into the open (la.lv, Le Monde). In Estonia, Defence Minister Hanno Pevkur publicly demanded Ukraine install "kill switches," automatic self-destruct mechanisms that destroy drones deviating from their programmed course. Finland's message was blunter: Defence Minister Häkkänen told Kyiv that using Finnish airspace "is strictly forbidden. Absolutely forbidden".

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

Racing to Close the Gap

Responses are moving fast on the hardware side. Rheinmetall and Deutsche Telekom announced a joint civilian drone-shield project four days before the Helsinki alarm, repurposing mobile towers as passive radar sensors. NATO launched counter-drone tests in Romania under Operation Eastern Sentry. The Bucharest Nine, a bloc of nine eastern-flank NATO members, called for consolidated air defence at their May summit.

These initiatives all target detection and interception. They do not solve the doctrine gap: when an allied drone crosses your border, who decides what it is, and what happens next? NATO's emerging European Drone Defence Initiative targets full operationality by 2027-2028, but it focuses on hostile drones, not the ambiguous third category that four countries already faced this month. The question is whether doctrine can catch up before the next drone doesn't land in an empty field.