Poland shot down drones that entered its airspace Wednesday, marking the first known instance of a NATO member firing weapons during Russia's war in Ukraine.
Warsaw said 19 objects had entered its airspace during a large Russian air attack on Ukraine and that it had shot down those that posed a threat.
Prime Minister Donald Tusk said he had activated Article 4 of NATO's treaty, under which alliance members can demand consultations with their allies.
"We are dealing with a large-scale provocation," said Tusk. "We are ready to repel such provocations. The situation is serious, and no one doubts that we must prepare for various scenarios."
Russia's RIA state news agency quoted a Russian diplomat as calling the accusations of an incursion "groundless" and saying Poland had not given any evidence that the drones shot down were of Russian origin.
