The Kuril Islands, also known as the Northern Territories, are a series of landmasses above Hokkaido that stretch to the south coasts of Russia1. During World War II, the islands were occupied by Soviet Union forces. The Yalta agreement, the Potsdam Declaration and the Treaty of San Francisco state that Japan must give up sovereignty of the Northern Territories but also states they are not under Soviet jurisdiction2. Ambiguities in these documents contribute to modern controversies between Russia and Japan known as the "Kuril Islands Dispute".

"Reclaim the Northern Islands from the Soviet Union" is one of the slogans championed by Ogata Masato's familiars in their right wing organization. This appears in Rowing the Eternal Sea by Oiwa Keibo.

Sources and Further Reading:

1http://en.wikipedia.org/wiki/Kuril_Islands

2http://en.wikipedia.org/wiki/Kuril_Islands_dispute