The Belgian government has told the BBC it is urgently trying to acquire drone defences after a sighting forced its main airport near Brussels to close temporarily.
Flights were paused at Zaventem airport on Thursday night, after drones were spotted nearby. They were also seen in other locations, including a military base.
At first, drones flying over our military bases were seen as our problem, Defence Minister Theo Francken said. Now it has become a serious threat affecting civilian infrastructure across multiple European countries.
Francken said several European allies have offered assistance, and he had accepted help from the German military which is providing anti-drone defences.
About 3,000 passengers of Brussels Airlines were affected by the disruptions, and the carrier said it faced considerable costs from cancelling or diverting dozens of flights.
EU compensation schemes don't apply here, Joelle Neeb of Brussels Airlines told the BBC.
But we do have an obligation to make sure passengers get to their final destination as soon as possible by offering refunds for alternative flights, as well as covering their hotels and transport.
She added that drones were a new threat and as such, the airline was adapting its contingency plans.
When our main airport is closed even for just 30 minutes, that has a big impact and we need to act fast.
Drone sightings have caused major flight disruptions across Europe in recent months, including in Sweden, Norway and Denmark.
Some officials have blamed hybrid warfare by Russia, but the Kremlin has denied involvement.
German Defence Minister Boris Pistorius has suggested these sightings could be linked to tensions surrounding European Union discussions on freezing Russian assets to support Ukraine.
Belgian security services suspect Russian involvement, yet Francken admits there is currently no evidence.
Suspicions are nonetheless fueled by serious airspace incursions carried out by Moscow recently, including incursions involving fighter jets and larger attack drones.
The Kremlin's actions likely aim to test European defences and divert attention from supporting Ukraine amidst ongoing hostilities.
Additional reporting by Bruno Boelpaep.
