Putin visits Kuril Islands as Japan reiterates sovereignty claim over disputed chain

Moscow administers the southern Kurils and has refused to hand them over, citing the outcome of the conflict in 1945. Japan argues that the islands were never lawfully transferred and has demanded their return as a condition for signing a formal peace treaty, the absence of which has left the two neighbours technically still at war.

Diplomatic efforts to bridge the gap have produced no visible progress over decades of negotiations. "Décadas de esfuerzos diplomáticos para negociar un acuerdo no han producido resultados visibles", Japan's foreign ministry said in a summary of its position. Successive Japanese governments have framed the dispute as a legal question rather than a purely historical grievance, pointing to allied statements made at the close of the war.

Strategic significance of the islands

The Kurils sit astride shipping lanes between the Sea of Okhotsk and the Pacific Ocean, and the waters around them are rich in fishing stocks. Both countries have stationed coast guard and naval vessels in the area, and security analysts say control of the chain gives Russia a maritime buffer shielding its Pacific Fleet bases further north.

Putin's itinerary included meetings with regional officials and visits to infrastructure projects on the islands, Russian state media reported. In recent years Russia has expanded military installations on the chain, moves Japan has tracked closely and repeatedly raised with its G7 and other partners.

Tokyo's response and the road ahead

For Tokyo, any high-profile Russian presence on the southern Kurils complicates an already strained relationship. Japan has aligned itself with Western sanctions imposed on Moscow and has provided non-lethal aid to Ukraine, prompting Russian officials to publicly question whether a peace settlement is realistic under current conditions.

Observers in Tokyo said the visit is unlikely to alter the legal posture of either side but will harden the diplomatic climate. Japanese officials indicated they would continue to press the case bilaterally and through international forums, while leaving the door open to dialogue on a peace treaty if territorial talks resume.

The episode underscores how territorial disputes inherited from the mid-twentieth century can persist long after the original conflict, complicating efforts at reconciliation even as trade, cultural and people-to-people links between Russian and Japanese citizens continue in limited form.