"...Russian Hostile Meddling Backfires in Northern Europe"

From Strategy Page:

On Feb. 11, Norway's intelligence agency severely criticized Russian jamming of GPS signals. The Norwegians said the Russian GPS signal disruption exploits that occurred last fall during NATO's Trident Juncture military exercise were not only a military concern but "also a threat to civil aviation in peacetime."

When Trident Juncture concluded in November, both the Finnish and Norwegian governments protested the GPS disruption. Norway blamed Russian transmitters at a military base located on the Kola Peninsula -- in the Arctic, east of Finland.

The Kremlin denied the accusation and said it had nothing to do with the jamming.
Despite the denial, given NATO's surveillance and detection capabilities, I think Norway and Finland have solid proof Russian electronic warfare units are culpable.

Trident Juncture's scenario is useful for understanding the current political context in the Baltic region.

The exercise was defensive. An aggressive power attacked Finland and Norway. NATO responded to defend Norway. NATO sea and air forces operated in the Baltic Sea and the Atlantic Ocean. The land maneuvers in Norway included U.S. and German armor. NATO aircraft supported Finnish forces in Finland....MUCH MORE