Poland has shot down drones that entered its airspace, the first time a member of NATO is known to have fired shots during Russia's war in Ukraine.

Poland 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 four of NATO's treaty, under which alliance members can demand consultations with their allies.

"We are dealing with a large-scale provocation," Tusk said on Wednesday.

"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 give

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