Russia builds surveillance bases near northern Japan. Is it ‘punishing’ Tokyo for supporting Ukraine?

Defence Minister Sergei Shoigu announced the new construction on the Kuril Islands on Friday, Russian state news agency TASS reported. The islands, the most southerly of which lie within sight of Hokkaido, were seized by Soviet troops in the closing days of World War II.

03:20

Japan’s leader makes history with unannounced visit to Ukraine in show of solidarity

“Moscow wants to show Japan that actions in support of Ukraine have costs and that those costs are not in Japan’s best interests,” he said.

Weakening Japan’s resolve on Ukraine would be a coup for Russia, although the islands are critical to its military ambitions in the Asia-Pacific.

“The importance of the islands goes well beyond any military bases that they build there,” said Garren Mulloy, professor of international relations at Daito Bunka University and a specialist in military issues.

“Those bases will be the eyes and ears into northern Japan, keeping Russia up to date on what Japan is doing based in its radar signals and, by extension, what its ally the US is also doing,” he said.

The chain of 56 major islands stretch more than 1,150km (715 miles) from the tip of northern Japan to the Kamchatka Peninsula, Mulloy pointed out, effectively enclosing the Sea of Okhotsk.

“Russia has come to consider the Sea of Okhotsk as its own exclusive area, and it is important as they can almost guarantee that it is free of foreign submarines of any other country and is a bastion for their own ballistic missile submarines,” he said.

“This entire area is protected by the Kurils, and they want to keep it that way.”

The chain of islands may not be as impenetrable as Russia would like, however, as US submarines covertly tapped Soviet undersea military communications cables in the Sea of