Russian drones entering Polish airspace was "an intentional act" meant to test the U.S. and NATO allies and send a "warning," says Kurt Volker, former U.S. Ambassador to NATO.

"You don't have that number of drones and that distance into Poland without it being deliberate by the Russian side," Volker, who served as NATO Ambassador under former President George W. Bush, said in an interview with Morning Edition .

NATO fighter jets shot down multiple Russian drones Wednesday after they entered Polish airspace near the country's eastern border with Ukraine. European officials described the act as deliberate provocation by Russia. It was the first time in NATO's history that alliance fighter jets engaged enemy targets in allied airspace.

European and NATO leaders condemned the incident as

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