COPENHAGEN, Denmark — Several unidentified drones shut down airspace over Copenhagen Airport on Monday night, prompting concerns that Russia could be behind the flyover above Scandinavia’s largest airport.

There was no indication that the operators of two to three drones intended to cause harm to anyone, police said, and the drones disappeared after several hours. The incident caused a major disruption to air traffic in and out of the airport.

While it wasn’t immediately clear who was behind the flyover, Denmark’s prime minister and NATO’s secretary-general said that Russian involvement couldn’t be ruled out. And now Denmark — already on edge because of its proximity to Russia — will join a group of front-line countries Friday to discuss the European Union’s plans for a “drone wall.”

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