NATO has been forced to scramble its F-16 fighter jets after a Russian attack breached Romanian airspace.
The nation's defence ministry said a drone had entered across the border after Vladimir Putin launched an onslaught on neighbouring Ukraine.
The country scrambled two F-16 fighter jets late on Saturday to monitor the situation following the strikes, a defence ministry statement confirmed.
They "detected a drone in national airspace" and tracked it until it disappeared from the radar near the Romanian village of Chilia Veche.
Nato acted swiftly to the alert after the group vowed to defend "every inch" of allied land earlier this week.
It came after Kremlin drones invaded Polish airspace - forcing Warsaw to shoot them down and trigger Nato Article 4, just one below the threshold