Denmark Briefly Closes More Airports After Unexplained Drone Sightings - The New York Times (Thanks to Sara for this one)
Mystery drones over Denmark are 'hybrid attack,' defense minister says - ABC News (Thanks to Graydon for this one)
European governments are on alert after Russian incursions into NATO airspace in Poland, Romania, and Estonia, but the Danish authorities said they could not say who was behind the latest incidents.
