More turf wars for Japan after Russia's Medvedev visits disputed Kuril Islands

President Dmitry Medvedev has triggered a huge diplomatic flap with Japan, with whom Russia is still officially at war. He ruffled Japan by staging a visit Monday to the disputed Southern Kuril Islands, four tiny specks of land seized by the Red Army in 1945 and claimed by Japan as its own ""Northern Territories.""

Japanese Prime Minister Naoto Kan told parliament Monday that Mr. Medvedev's decision to become the first Soviet or Russian leader to set foot on land Japan regards as its own was ""extremely regrettable."" Foreign Minister Seiji Maehara said the visit ""hurts our national sentiment,"" and called in the Russian ambassador to Tokyo to deliver an official note of protest.

Russian Foreign Minister Sergei Lavrov slammed back, telling journalists that the Japanese reaction to Medvedev's visit was ""unacceptable,"" adding, ""this is our land and the Russian president visited Russian land. It's an entirely domestic matter.""

Moscow insists that the four tiny volcanic islands just off the northern tip of Hokkaido are rightfully Russian territory, endorsed by wartime agreements between the Allies at Yalta and Potsdam. But Tokyo argues that, unlike other post WW II territorial transfers, the legal case with the Kuril Islands remains murky and subject to further negotiation.

Most experts say the fate of the Kurils is the single reason Japan and Russia have failed to sign a formal peace treaty in the 65 years since the war ended, and there is no more certain way to stoke national passions in both countries than by raising the issue.

So why did Medvedev, returning to Moscow from a state visit to Vietnam, go several thousand miles out of his way to spend a morning on a barren rock that the Russians call Kunashir Island, the closest of the four to Japan?"