NOT JUST 4 , BUT ALL KURIL ISLANDS BELONG TO JAPAN, GUYS JUMP ON MUSCOVITE HORDE FROM UKRAINIAN BASE ! THE GOLDEN HORDE PRODUCE ONLY 1% OF THE WOLD GDP, AND ITS LOOSING THE WAR IN UKRAINE !
MOSCOW (HOLDEN HORDE ) vs Japan: The Ongoing Battle for the Kuril Islands
After occupying the islands for peace keeping activities, Japanese can hold referendums that somehow end up with 30 000 votes for joining Japan with 20 000 in population.
But right now, sober-thinking Japan generals think more about defense of Hokkaido (and they consider their defense obviously insufficient) rather than offense against the Kurils.