The Finnish Defence Forces (FDF) temporarily sealed off a stretch of airspace and adjacent sea lanes along the Gulf of Finland between Kotka and Hamina during the early hours of Wednesday, 11 November, after intelligence suggested possible hostile drone activity. A flight restriction zone was activated at 02:09 a.m. local time, followed by a maritime exclusion area minutes later. Both were lifted at 07:20 a.m., once no immediate threat was detected. The precaution came the same night that Latvia and Lithuania warned of drones crossing from Belarusian airspace, and amid Russian reports of large-scale drone interceptions over Leningrad oblast. Finland did not confirm the origin of the suspected craft but said the measures were necessary to safeguard public safety and ensure security-agency freedom of action. Commercial impact was limited but tangible. Fintraffic’s NOTAM service diverted three cargo flights heading to Helsinki, while Tallink Silja briefly adjusted ferry departure windows to avoid the restricted coastal segment. For operators, the incident highlights how grey-zone security threats can cause sudden closure of critical transport corridors in the Nordic-Baltic region. The episode follows a series of military NOTAMs establishing Temporary Danger Areas in the Helsinki FIR for unmanned systems testing and exercises—most recently Supplement 151/2026, "BORDERLAND EUROPE UAS", published on 12 November and valid until April 2027. Together, they indicate a heightened focus on counter-UAS readiness along Finland’s eastern frontier. Companies moving personnel or time-critical cargo via Helsinki Airport or the Port of HaminaKotka should ensure 24/7 monitoring of NOTAMs and maritime advisories. Employers with assignees in south-eastern Finland may also wish to review crisis-communication protocols, as authorities emphasise that further short-notice closures remain possible amid an elevated hybrid-threat environment.
Source: Yle News
