Who is actually jamming airplanes’ GPS in the Baltic?

.ON APRIL 29TH Finnair, Finland’s national airline company, stated that it would certainly suspend tours to the eastern Estonian urban area of Tartu for a month. Last week two airplanes were actually pushed to reverse after their GPS indicators were actually interfered with. Family doctor playing has boosted greatly in the Baltic location over recent pair of years.

Who is behind it and exactly how unsafe could it be actually?