Who is jamming airplanes’ GPS in the Baltic?

.ON APRIL 29TH Finnair, Finland’s nationwide airline, mentioned that it would put on hold air travels to the far eastern Estonian urban area of Tartu for a month. Recently two aircrafts were actually forced to shift after their GPS indicators were interrupted. GPS playing has actually raised dramatically in the Baltic location over recent two years.

Who lags it and how harmful could it be?