If Europe hesitates to act, the grey-zone campaign will grow, Ursula von der Leyen warns. Photo: AP PHOTO

Russia is waging a "targeted grey-zone campaign" against Europe, including airspace violations, sabotage and cyberattacks that will only escalate if the Kremlin is not challenged, the European Union's top official warns.

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European Commission President Ursula von der Leyen said that in just two weeks, fighter jets had breached Estonia's airspace, while drones overflew military bases and critical infrastructure sites in Belgium, Denmark, Germany, Poland and Romania.

"Europe must r

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