Who supervised the Kuril Islands in history?

Thousand Islands (Russian: кури? льские острова? /Thousand Islands Austerova; Japanese: Thousand islands/クリル；; Kuril(e) Islands, located between kamchatka peninsula in the Russian Far East and Hokkaido Island, separates the Pacific Northwest from the Sea of Okhotsk. Total length 1300 km, consisting of 56 islands. The Kuril Islands are now under the jurisdiction of Sakhalin Island in Russia. Ainu people (Ainu people) are local aborigines.

Since18th century, Japan and Russia have developed here successively. 1855, the two countries signed a Japan-Russia friendship treaty, which stipulated that the South Kuril Islands south of Fukushima Island belonged to Japan, and Japan successively established administrative divisions in the South Kuril Islands. It was not until 1945 that the Soviet Union launched the August storm military action and occupied the South Kuril Islands before the end of World War II. Four northern islands ("South Kuril Islands")

1945 During the Yalta Conference, the United States and Britain promised that the Soviet Union could gain full sovereignty over South Sakhalin Island and Thousand Islands after the war, and signed the Yalta Agreement. After Japan surrendered, the Soviet Union declared sovereignty according to the Yalta Agreement. In Chapter 2 "Territory" of the San Francisco Peace Treaty signed in 195 1, it was agreed that Japan would give up all rights and claims to the Kuril Islands and Sakhalin Island acquired after the Portsmouth Peace Treaty of 1905. There is no agreement on the scope of the Kuril Islands in the clause, but when signing the contract, the scope of abandonment passed by the Japanese parliament includes the island after the country and the island to be seized. However, the Soviet Union did not sign this peace treaty at that time. Until 1956, the Soviet Union and Japan signed the Soviet-Japanese Joint Declaration, but because the two countries could not reach a consensus on the sovereignty of the South Kuril Islands at that time, the Japanese parliament also cancelled the resolution of abandoning the island behind the country and choosing to catch the island in February 1956, and did not give up the sovereignty of the South Kuril Islands; Although the Soviet Union initially agreed to return the Tooth Dance Islands and Sedan Island, it was impossible to understand the island after the country and the island after the capture. Therefore, when it finally signed the contract, it did not reach any agreement on territorial disputes, and there was no relevant content in the declaration. Since then, in 2004, Russia decided to return the smaller Tooth Dance and Sedan Island (accounting for 6% of the disputed area), but it was rejected by Japan.