NATO concluded a major anti-drone exercise this week, with Ukraine taking part for the first time as the Western alliance seeks to learn urgently from the rapid development and widespread use of unmanned systems in the war there.

The Bucharest 9 group of countries said there was "profound concern" at Russian drones landing in territories neighboring Ukraine.

The drills at a Dutch military base, involving more than 20 countries and some 50 companies, tested cutting-edge systems to detect and counter drones and assessed how they work together.

NATO allies and over 50 private defense companies gathered at De Peel Air Base in the Netherlands on September 19 to test and learn from Ukrainian drone operators and developers who apply their own innovations on the battlefield.

The Netherlands is hosting an exercise under the auspices of the North Atlantic Alliance to test counter-drone systems, running until 20. This is the first time Ukraine has participated in the exercise.

NATO must take "robust coordinated" measures in response to incidents where Russian missiles or drones launched by Ukraine invade the alliance's airspace, according to Romanian Defense Minister Angel Tîlvăr.