Who is actually jamming airplanes’ family doctor in the Baltic?

.ON APRIL 29TH Finnair, Finland’s nationwide airline, claimed that it would put on hold flights to the eastern Estonian urban area of Tartu for a month. Last week two aircrafts were compelled to shift after their general practitioner signs were actually interfered with. GPS jamming has increased greatly in the Baltic location over recent 2 years.

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