The Kuril Islands, which Japan refers to as its Northern Territories, have been a point of contention since the Soviet Union seized them after World War II. Putin's August visit to Iturup island, where he toured a fish processing complex, inflamed the dispute. Thousands of former Japanese residents of the islands are still alive, and the Japanese government maintains its claim.
According to The Diplomat, over the past several years Russian forces have been increasingly active far south of the Kurils, near Japan's southwestern-most islands. These operations, sometimes conducted alongside Chinese forces, demonstrate Russia's willingness to challenge its rivals and extend its military influence in the region. The article states that the Russian navy is showing its reach around Japan's southwestern islands, a development that adds a new dimension to the security environment in East Asia.
The situation unfolds against a backdrop of broader regional rivalries, with Japan deepening its alliances with the United States and other partners while facing pressure from both Russia and China in adjacent waters.