A drone swarm that flew over Germany deliberately surveyed the NATO ally's critical infrastructure, according to an internal government memo.

The European Union is talking about shoring up defenses in its eastern airspace. Recent Russian drone incursions have lent urgency to the project.

Denmark’s defense ministry said that a precision radar system has been set up at Copenhagen airport to help keep watch.

European Union leaders meeting in Copenhagen this week will discuss a slate of flagship defense projects, including a European drone wall and an air-defense shield.

European Union leaders will discuss proposals for a "drone wall" to protect the continent at a summit on Wednesday in Copenhagen, just days after airspace intrusions by unidentified unmanned aircraft forced a temporary closure of Danish airports.

KYIV, Ukraine -- The Ukrainian military is sharing with European countries its expertise in fighting Russian drones, sending a mission to Denmark for joint exercises, Ukraine President Volodymyr Zelenskyy said Tuesday. “Our military has begun deploying a mission in Denmark to disseminate Ukrainian experience in drone defense," Zelenskyy said.

A spate of recent drone sightings near airports in Denmark and Norway has amplified security concerns in Europe.

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Denmark's defense ministry reported more drone sightings overnight Saturday into Sunday at several of its armed forces' locations.

Fianna Fáil has said it was an "oversight" that it used a drone to shoot footage of a park run by presidential candidate Jim Gavin in an area where drones are not allowed to be flown without being given the all clear for safety.