At a Polish military school, teenagers in military-style uniforms crowded around a 15-year-old classmate, pushing him to "search for Russians," as he hunted for targets on a drone simulator.

For them it was just a game -- but for Poland, the threat is seen as very real.

Warsaw and its NATO allies scrambled fighter jets last month when they had detected around 20 drones they said were piloted by Russia, flying through Poland's airspace. A few were shot down and Prime Minister Donald Tusk warned his country was closer to conflict that at any point since World War II.

It was a stark example of NATO's vulnerability to a possible drone attack, prompting many countries to assess their warfare capacities against the aerial devices.

Just days earlier, a military school in Poland's western town

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