From the Sun [caution, tabloid]:

Russians are behind the mysterious drones that forced Denmark and Norway’s main airports to shut down, Volodymyr Zelensky has claimed. Copenhagen airport, the busiest in the Nordic region, was closed for four hours last night while Oslo airport shut down operations for three hours after large drones were spotted flying close by.

While authorities are still investigating the origin of the drones, they said they were likely flown by a “capable operator” who wanted to “show off.” Denmark‘s intelligence agency said the country faces “high threat of sabotage” after the drone sightings.