Denmark has banned all civilian drone flights this week ahead of a European Union summit in Copenhagen, the country's transport minister said on Sunday.

The ministry said the decision was made in order to simplify security work for the police, and they could not accept foreign drones creating uncertainty and disruption.

Denmark is one of several European countries that have reported drone incidents in recent weeks, with unidentified drones sighted above Danish military sites as recently as Saturday.

Defence ministers from 10 EU countries have agreed to create a drone wall in response to the sightings, and NATO says it has enhanced vigilance across the Baltic.

In their statement announcing the ban, the transport ministry said police were on significantly increased alert ahead of this week's summit and that they needed to take care of Danes and our guests.

The ban will remain in place until 3 October, and violations could result in a fine or imprisonment for up to two years.

Sweden's Prime Minister Ulf Kristersson said his country would support Denmark with military anti-drone capabilities at the summit, adding that powerful radar systems had already been loaned to its Nordic neighbour.

France stated it would provide similar assistance to Denmark, deploying a specialist helicopter and a team of 35 experts.

Denmark currently holds the rotating presidency of the Council of the EU.

Unidentified drones have been reported in Denmark since 22 September, when sightings forced the closure of Copenhagen and Oslo airports. Aalborg and Billund airports also suspended operations last week due to drone activity.

Danish investigators have not yet identified those responsible for the flights, with the defence minister labeling the incident a hybrid attack part of a systematic operation. Prime Minister Mette Frederiksen indicated the investigation continues, without ruling out Russian involvement.

Moscow has denied any link to the drone incidents. Europe remains on high alert following reports of hybrid attacks and incursions by Russian air forces in NATO member states.