This is shown by the survey conducted by the Swedish Transport Agency together with its counterparts in other countries around the Baltic Sea.
The development means a growing danger for air safety, the countries write in their report to the International Civil Aviation Organization (ICAO) which SVT has taken part of.
The authorities have also tracked where the disturbances come from. Through measurements, they have been able to locate jamming transmitters in Russian Kaliningrad, St. Petersburg, Smolensk and Rostov.
As recently as Monday, there were reports of a suspected disruption attack against the flight that the President of the EU Commission, Ursula von der Leyen, was traveling in.
