LUXEMBOURG (AP) — NATO is working to thwart Russian jamming of civilian flights, said the alliance’s chief on Tuesday, two days after a jet carrying European Commission President Ursula von der Leyen lost its ability to use GPS navigation midair in Bulgarian airspace.

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

“It is taken very seriously,” said NATO Secretary-General Mark Rutte during a news conference in Luxembourg with the duchy’s prime minister and defense minister. “I can assure you that we are working day and night to counter this, to prevent it, and to make sure that they will not do it again.” He did not elaborate.

Neither Russia nor von der Leyen has commented publicly on the incident. The EU and NATO are

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