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How did repeated glaciation help form the Sea of Okhotsk?

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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

The Sea of Okhotsk was formed within the past two million years through the combined action of repeated glaciation. This geological process, characterized by the cyclical advance and retreat of ice, played a fundamental role in shaping the basin of this northwestern arm of the Pacific Ocean.1