Kunashir Island (Russian: Кунаши́р, romanized: Kunashír; Japanese: 国後島, romanized: Kunashiri-tō; Ainu: クナシㇼ, romanized: Kuna=sir), possibly meaning Black Island or Grass Island in Ainu, is the southernmost island of the Kuril Islands archipelago. The island has been under Russian administration since the end of World War II, when Soviet forces took possession of the Kurils. It is claimed by Japan (see Kuril Islands dispute).