Europe is in the middle of a hybrid war waged by Russia and the continent must arm itself, Danish Prime Minister Mette Frederiksen has told a summit of European Union leaders in Copenhagen.

"I hope that everybody recognises 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 that we see sabotage or we see drones flying," Frederiksen said.

Wednesday's summit comes after a spate of troubling drone incidents at Danish airports and military bases over the last week. Ahead of the meeting, a special radar system was set up at Copenhagen airport to help keep watch.

Unidentified drones forced the closure of the airfield a week ago, causing major disruptions.

France, Germany, the Netherlands, Sweden and the UK also

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