Two NATO members say Russian drones breached their airspace

The incidents prompted officials to call for measures to act jointly to counter Russia air incursions.

NATO Deputy Secretary General Mircea Geoana denounced the incidents as "irresponsible and potentially dangerous", while saying there was no indication of a deliberate attack on Alliance member-states.

The Romanian defence ministry said the "radar supervision system identified and tracked the path of a drone which entered national airspace and then exited towards Ukraine".