Shikotan (Russian: Шикотан; Japanese: 色丹島; Ainu: シコタン or シコタヌ, Sikotan), also known as Shpanberg (after Martin Spangberg), is an island that is administered by the Russian Federation as part of Yuzhno-Kurilsky District of Sakhalin Oblast, and that is claimed by Japan as part of Nemuro Subprefecture of Hokkaidō Prefecture. It is one of the islands (along with the Habomai Islands) which the Soviet Union agreed in 1956 to transfer to Japan in the event of a peace treaty between the two countries (such a peace treaty has never been concluded).