By Charlie Devereux

(Reuters) -Polish Prime Minister Donald Tusk said on Wednesday he had asked NATO to open consultations under Article 4 of the alliance’s treaty after Poland shot down drones in its airspace following what he called a “large-scale provocation” by Russia.

WHAT HAPPENED?

Poland said it had downed 19 drones over its territory during a large Russian air attack on Ukraine, the first time a NATO member state is known to have fired shots in the war.

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.

Several European officials described the incursion as intentional and a sign of Russian escalation.

WHAT IS ARTICLE 4?

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