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Why is Ion Island unusual among the Sea of Okhotsk islands?

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Vertical physical map showing the seas of Japan and Okhotsk, highlighting underwater basins, trenches, and ridges, as well as the coastlines and boundaries of Russia, China, North Korea, South Korea, and Japan. Major cities, islands, and peninsulas such as Vladivostok, Tokyo, Hokkaido, Sakhalin, Kamchatka Peninsula, and the Kuril Islands are labeled. Water depths are indicated with color shading, and an inset locator map shows the region's position in East Asia.
Sea of Okhotsk

Ion Island is considered unusual among the islands of the Sea of Okhotsk because it is the only one situated in the open sea. While other major islands in the region, such as the Shantar, Zavyalov, Spafaryev, Yam, and Tyuleny islands, are located close to the shore, Ion Island stands apart by its isolated position.1