It seemed slightly delusional (but mostly harmless) to me at the time, but now - who knows?
I don't think even the Japanese government wants them back at this point, Hokkaido (the nearest big island) is already rapidly depopulating and having to administer a bunch of semi-frozen islands with random Russian pensioners and no resources aside from fish would be a logistical nightmare and permanent drain on the treasury.
> Although by the terms of Article (2c) of the 1951 San Francisco treaty, Japan renounced all rights to the Kuril Islands, the treaty did not apply to the islands of Kunashiri, Etorofu, Shikotan and Habomai since they are not included in the Kuril Islands. Also, the Soviet Union did not sign the San Francisco treaty.