This situation brings us the closest we have been to open conflict since World War II," Polish Prime Minister Donald Tusk said.

Poland says that it and its NATO allies had shot down Russian drones that violated Polish airspace in what it called an “act of aggression” as Russia launched aerial attacks on Ukraine.

President Volodymyr Zelenskyy has said that Ukraine has offered to work with its partners on the joint defence of airspace against Russian drones, but noted the lack of a robust international response to the incursion of Russian drones into Poland.

Washington’s ambassador to Nato vowed the US will defend “every inch of Nato territory” as Russia faces worldwide condemnation for drone incursion