Sept. 1 (UPI) -- Russia is suspected of interfering with the Global Positioning System of a jet carrying European Commission President Ursula von der Leyen, the European Union said Monday

She was in a chartered jet Sunday headed from Poland to southern Bulgaria as part of a tour of eastern EU countries, including "front line" states of Latvia, Finland, Estonia, Poland, Lithuania and Romania bordering Russia and Belarus. She was expected to discuss defense readiness as part of the tour.

Bulgaria borders Romania and is 1,000 miles from western Russia.

Despite no functional GPS, the plane landed safely at its intended airport in Plovdiv, Bulgaria, though pilots relied on paper maps, the Financial Times reported.

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