Historically: It belongs to Japan.
Now: All 56 of the islands are under the Russian jurisdiction, but Japan claims the South Kuril Islands.
Japan claims only 4 islands:
Kuril islands
Chain of Kuril Islands. The Northern Territories dispute or Kuril Islands dispute is a dispute between Russia and Japan and also the Ainu people over control of South Kuril Islands.
the kuril government
Invasion of the Kuril Islands happened on 1945-09-01.
The Kuril Islands are the islands that Russia controls northeast of Japan. The Kuril Islands are officially under the Russian jurisdiction.
The Kuril Islands are under the jurisdiction of Russia. However, Japan still has a claim to the four most southern islands.
russia
Okhotsk.
Asia
kuril islands
kuril islands
Asia