Drone sightings caused flight cancellations and airport closures in Copenhagen and Oslo, with no arrests or confirmed links to Russia.

Drone sightings near Copenhagen and Oslo airports in September 2025 caused temporary airspace closures, halting flights and leading to widespread cancellations and diversions. Copenhagen Airport suspended all operations for nearly four hours after reports of two to four large, unidentified drones, prompting rerouting to airports in Denmark and Sweden. Oslo Airport also briefly closed due to a separate drone sighting, with incoming flights diverted. Authorities in both countries confirmed investigations but found no immediate threats or links to recent Russian drone activity in Eastern Europe. No arrests were made, and the origins of the drones remain unknown. Both airports have since resumed normal operations, though delays and cancellations continued.