Poland said on Wednesday that at least 19 Russian drones breached its airspace over the course of seven hours, in what leaders across Europe are calling the most serious violation of NATO territory since Russia's full-scale invasion of Ukraine began more than three years ago.

The Polish military described the incident as an "act of aggression" and said the drones were brought down with the help of NATO allies. Dutch F-35s intercepted several of the aircraft, and German Patriot missile batteries in Poland were placed on alert. NATO confirmed it was the first time alliance forces have engaged potential threats inside its own airspace during the war.

ADDITIONAL REPORTING | Russian drones breach NATO airspace Poland says it shot down Russian drones which entered its airspace for several

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