Watch At Red Stones Outpost (1970) Official Trailer

The film takes place near the border outpost "Red Stones". Three guys: the grandson of a herdsman, his cousin, who came on vacation from the city and the daughter of the head of the frontier post, met by chance in the Kazakh border steppes, where they spent time playing games. But when the real danger comes to replace the games, the guys proved to be real border guards.