Who is congesting airliners’ GPS in the Baltic?

.ON APRIL 29TH Finnair, Finland’s national airline, stated that it would certainly put on hold flights to the asian Estonian metropolitan area of Tartu for a month. Last week two airplanes were actually obliged to shift after their GPS indicators were actually disrupted. GPS jamming has actually increased greatly in the Baltic location over the past 2 years.

That is behind it and just how hazardous could it be actually?