France, Germany and Sweden will send military personnel and anti-drone systems to Denmark to boost security at this week's European summits in Copenhagen, after drone incursions that forced Denmark to shut several airports.

Denmark is due to host EU leaders on Wednesday, followed by a summit on Thursday of the wider, 47-member European Political Community. It has already said it has increased security around the events after the drone sightings.

Drones disrupted air traffic at six Danish airports last week, including at Copenhagen, the Nordic region's busiest, in what Prime Minister Mette Frederiksen called a hybrid attack on her nation.

Denmark has stopped short of saying definitively who it believes is responsible, but Frederiksen has suggested it could be Moscow, calling Russia the p

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