NATO is working to counter Russia's jamming of civilian flights, the alliance's chief said on Tuesday, two days after a plane carrying European Commission President Ursula von der Leyen lost its ability to use GPS navigation mid-air in Bulgarian airspace.

The plane landed safely on Sunday, but Bulgarian authorities said they suspected Russia was behind the interference.

The whole continent was under "direct threat from the Russians," Secretary General Mark Rutte said during a news conference in Luxembourg with the duchy's prime minister and defence minister.

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"We are all on the eastern flank now, whether you live in London or Tallinn."

"It is taken very seriously," Rutte added, "I can assure you that we are working day and nigh

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