BRUSSELS (Reuters) -Russia’s drone incursions and airspace violation of European NATO countries has increased since September, when more than 20 Russian drones entered Polish airspace and three Russian military jets violated Estonia’s airspace for 12 minutes.

Since then, many drone flights, the origin of which are mostly unknown, have disrupted airspace operations in Europe.

European Commission President Ursula von der Leyen has called the incursions “hybrid warfare”, and while she has not said Russia was responsible for all the incidents, she said it was clear Russia’s aim was to “sow division” in Europe.

Below are some of the biggest airspace violations and drone sightings reported so far this year:

BELGIUM

The Brussels and Liege airports were closed on Tuesday evening after drones

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