Who is actually obstructing airplanes’ GPS in the Baltic?

.ON APRIL 29TH Finnair, Finland’s national airline, stated that it will put on hold trips to the far eastern Estonian metropolitan area of Tartu for a month. Last week 2 aircrafts were actually forced to shift after their family doctor signs were actually disrupted. Family doctor jamming has raised greatly in the Baltic region over recent 2 years.

That lags it and also just how harmful could it be actually?