Volodymyr Zelensky has criticised Nato for not shooting down a drone that flew over Romania en route to Ukraine.

The Ukrainian president said the incursion of a drone into the airspace of a Nato member was a provocation that should have been immediately met and not just monitored.

“Do not wait for dozens of Shaheds [Iranian drones] and ballistic missiles before finally making decisions,” Mr Zelensky said.

The drone strayed 10km into Romanian airspace late on Saturday, according to the Ukrainian defence ministry.

It follows the intrusion of Russian drones into Polish airspace on Wednesday, raising the prospect that Vladimir Putin is deliberately testing Nato members with acts of aggression.

Two Romanian F-16 fighter jets, supported by two German Eurofighter Typhoons, tracked the drone for around 50 minutes as it flew over Romania before allowing it to enter Ukraine.