In 1945, with the defeat of Japan in World War II, the Japanese administration in Karafuto ceased to function, and since 1951, the southern part of Sakhalin has been a part of Russia.
The Japanese administration in Karafuto ceased to function. This was with the defeat of Japan in World War II. This was in 1945. The southern part of Sakhalin has been a part of Russia. This was since 1951. This was in 1945.