Marienkhof (German) or Dunayevka (Russian) is an air base in Kaliningrad Oblast, Russia located 10 km south of Pionersky. It was in use during the 1950s and has been abandoned near the end of the Cold War. It has a spartan layout, unimproved pads, if any, and alert strip feeding directly onto runway threshold, thus it may have been used by a Soviet Anti-Air Defense regiment. It is now the location of Pionersky Radar Station.