Who is actually obstructing aircrafts’ general practitioner in the Baltic?

.ON APRIL 29TH Finnair, Finland’s nationwide airline, mentioned that it will suspend air travels to the asian Estonian urban area of Tartu for a month. Last week two planes were actually pushed to shift after their GPS signs were interfered with. Family doctor playing has boosted sharply in the Baltic location over the past pair of years.

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