Denmark, a founding member of NATO, has added to growing alarms about the threat of “hybrid war” from Russia as drone sightings spread to more European airports and even military installations.

On Thursday, the airport in Munich, Germany, grounded flights after several drone sightings. And on Friday, Belgium said it was investigating drone sightings above a military base near the German border. That’s after Denmark also reported drones flying above its airports and largest military base .

“I hope that everybody recognizes now that there is a hybrid war, and one day it’s Poland, the other day it’s Denmark and next week, it will probably be somewhere else,” Danish Prime Minister Mette Frederiksen told reporters on Wednesday. “There is only one country…willing to threaten us, and it is Ru

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