An unexplained drone incursion shut down the largest airport in Scandinavia on Monday evening, prompting officials to question whether Russia was responsible.

Danish officials reported that a "professional actor" was likely responsible for flying multiple drones over the Copenhagen Airport, causing a four-hour shutdown. Large drones have been spotted at five regional airports in Denmark.

'We have seen drones over Poland that should not have been there. We have seen activity in Romania. We have seen violations of Estonian airspace.'

Monday's incident marks the latest in a series of drone sightings to cause a significant disruption to transportation infrastructure in NATO countries.

"It's definitely not a coincidence. It looks systematic," Defense Minister Troels Lund Poulsen stated du

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