France will ask Russia’s ambassador to explain what happened when he fulfills a summons after a drone struck an apartment building in Romania, Foreign Minister Jean-Noel Barrot said on Friday, calling the incident irresponsible.

Barrot had already summoned the Russian envoy earlier this week following air strikes that targeted civilians in Ukraine last weekend.

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“We have an irresponsible act involving a drone, and it is not the first time. On several occasions, Russian drones and other aircraft have strayed into the airspace of the European Union and NATO,” Barrot told France Inter radio.

France is the lead NATO nation in Romania, with about 1,500 troops deployed there as part of the alliance’s defense posture.