Do you think Sakhalin Island and all the Kuril Islands should belong to Japan?

Question:

Answer:

Had we won WWII, yes.
Had the US not intervened in Japan's business in Asia in the 1930's, southern half (at least) of the Sakhalin and all the Kuril Islands (that we won as a result of the Japan-Russo War in 1904-1905) may have still been part of Japan's territory even today. But in realistic sense, and to answer your question straightforwardly, I cannot say they "should" belong to Japan.

But what we (majority of the Japanese) can say for 100% sure is that "the Northern Territory of Japan (the four islands off the coast of Hokkaido still illegally occupied by Russia)" is NOT part of the Kuril Islands. The Etorofu, Kunashiri, Habomai and Shikotan islands are part of Japan's own territory.

I could write a 50-page paper on this issue, but I guess you don't have time to read it. So, I think I'd better shut up my mouth here. But, if I wrote a paper, I would write about:
1. Japan's inherent territory off the northern coast of Hokkaido.
2. Japan-Russo territorial disputes prior to the war in 1904.
3. Legitimacy of the Treaty of Portsmouth in 1905 as a result of Japan-Russo War.
4. Grave mistakes by F.D. Roosevelt in talks with J. Stalin at Yalta Conference in Feb, 1945.
5. The Treaty of Peace between Japan and the Allied Powers in 1947.

As you may know well, the USSR (back then) did not sign the treaty in 1947, and Russia (today) is still refusing to conclude a territorial treaty with Japan, claiming that the four islands off the coast of Hokkaido is part of the Kuril Islands.