Smaller airports in southern Denmark also reported drone activity, but were not closed. This morning, Danish authorities categorised it as a "hybrid attack" that came from a "professional actor". The drones were launched locally, they said, but they did not directly blame Russia - or anyone else.

German defence startup Helsing unveiled a new autonomous combat drone on Thursday, joining a race to build remote-piloted systems that can swarm into battle with fellow robots or team up with crewed fighters to help reshape the future of air warfare.

Militaries around the world are seeking low-cost, easy-to-make ways to exhaust an enemy’s air defenses.

On Monday night Kastrup airport in Copenhagen was forced to shut down for several hours following several drone sightings.

The explosions happened Saturday night an area controlled by Viv Ansanm, a powerful gang coalition that the U.S. has designated as a foreign terrorist organization.

Estonia is extending a fence along its border with Russia and building anti-tank ditches and bunkers in preparation for a potential conflict with Moscow.

A flotilla carrying aid bound for Gaza was attacked off the coast of Greece Tuesday by about 15 drones. Greta Thunberg is aboard a ship in the flotilla.