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Edited by: Rob Turner

Russian President Vladimir Putin has visited the far-eastern Kuril Islands for the first time, state media reported on Thursday, drawing anger from Japan.

Japan has long claimed ownership of four of the Kuril Islands, including the one reportedly visited by Putin, which the Soviet Union seized toward the end of World War II.

What is the dispute over the Kuril Islands?

During his trip, Putin visited a fish-processing plant on the island, known as Iturup in Russian and Etorofu in Japanese, where he was given caviar, Russian media reported.

The island belongs to four that are known in Japan as the Northern Territories and that are now Russian-occupied following the Soviet Union's takeover in 1945.

At that time, Moscow deported their Japanese population of about 17,000 people, with the islands now inhabited by some 20,000 Russian citizens.

The unresolved dispute was one of the key reasons why Moscow and Tokyo never signed a formal World War II peace treaty.

Russian-Japanese relations have since suffered another major blow following Russia's full-scale invasion of Ukraine launched in 2022.

The volcanic Kuril archipelago runs in an arc from Russia's Kamchatka peninsula down to Japan's main northern island of Hokkaido.

What has Japan said about Putin's visit?

In a statement on Thursday, Japan's foreign minister, Toshimitsu Motegi, expressed Tokyo's great displeasure at Putin's visit.

"The Northern Territories ... are an inherent part of Japan's territory both historically and under international law, and the government of Japan strongly protests this visit," the statement said.

Strategically-located Kuril Islands

The islands have seldom been visited by Russian leaders, with then-President Dmitry Medvedev in 2010 becoming the first to travel to the disputed territory.

Medvedev also went there in 2015 as prime minister.

Putin's visit to the Kurils came after he visited the nearby Russian island of Sakhalin, where Russia's navy was conducting drills.

The islands had considerable strategic importance for the Soviet Union, which kept a large military presence there during the Cold War amid tensions with the US and Japan.

Talks on the territorial issue that have been held since the fall of the Soviet Union in 1991 have so far borne no fruit.

Disclaimer: This report first appeared on Deutsche Welle, and has been republished on ABP Live as part of a special arrangement. Apart from the headline, no changes have been made in the report by ABP Live.