Some of the supposedly Russian soldiers (who are not merely posing as Swedish soldiers) are equipped with Swedish military-issue submachine guns, model m/45 B, which have never been a part of Russian military equipment.
After the Ninja team takes out the border guards and steals their Jeep, there's a road sign in Swedish which reads "Mötesplatsskylt" (to mark a section of the road that has been broadened to make place for meeting traffic). But they are in Russia.