Diplomatic tensions between Moscow and Tokyo have escalated following a visit by Russian President Vladimir Putin to the Kuril Islands. The islands, which Japan refers to as the Northern Territories, have been a source of friction since they were seized by the Soviet Union at the end of World War II in 1945.

Following Putin’s trip to the islands—which occurred after his visit to the nearby Russian island of Sakhalin—the Japanese government issued a formal condemnation. In response, the Russian Foreign Ministry summoned the Japanese ambassador to Moscow to express its dissatisfaction with Tokyo's stance. This move mirrors a reciprocal action by Japan, which also summoned the Russian ambassador to protest the presidential visit.

The dispute over the sovereignty of these islands has prevented the two nations from signing a formal peace treaty to officially end their World War II hostilities. While Russia maintains that the islands are an integral part of its territory, Japan continues to assert its historical claim to the region. The recent diplomatic exchanges highlight the ongoing difficulty in resolving this territorial impasse, as both nations continue to use formal diplomatic channels to signal their refusal to concede on the matter.