Hybrid attacks across Europe While Denmark has stopped short of accusing Russia over overnight drone strikes, Europe remains on high alert following a series of airspace violations reported by NATO members, some of whom point to Moscow NATO members RUSSIA UKRAINE POLAND ESTONIA NORWAY ROMANIA SWEDEN Aalborg airport Also serves as military base Esbjerg Skrydstrup: Home to some F-16 and F-35 fighter jets Sønderborg Copenhagen Billund DENMARK Airports forced to close temporarily Drones observed 40km 25 miles 1 2 3 4 5 6 1 2 3 4 5 6 Sep 25, Denmark: Defence minister says country has suffered a “professional” hybrid attack after drones fly over five airports overnight Sep 22, Denmark: Sightings of two or three large drones near Copenhagen airport halt all take-offs and landings for nearly four hours Sep 22, Norway: Airspace at Oslo airport also closed for nearly five hours after a drone is detected Sep 19, Estonia: Three Russian MiG-31 fighter jets enter Estonia’s airspace for 12 minutes over Gulf of Finland. Russia denies violating airspace Sep 14, Romania: Russian drone breaches airspace, defence ministry says. Moscow does not comment Sep 10, Poland: Warsaw reports around 19 drone incursions, forcing four airports to close. At least three drones shot down. Russia says its actions are not deliberate Sources: BBC, Reuters © GRAPHIC NEWS