I have first hand experience (last summer) with the radar in that area operated by Norway, Sweden, and Finland. VFR below 10,000 feet, I was twice warned well in advance that my track could carry me into another nation's airspace, and this is unwelcomed. I did not violate any airspace, but admit that I was not taking it as seriously as the nations were, and I respect their right to assert their airspace.
For how "out in the middle of nowhere" that area appears, ATC sure know what's happening! We flew on a flight plan down the Russian/Finnish boarder, about a mile inside Finland at their extreme northern boarder, and Finnish ATC requested that I fly farther away from the boarder. I complied.