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How do winter ice floes make navigation difficult in 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

In the Sea of Okhotsk, winter ice floes serve as a significant physical impediment to maritime navigation. Because the sea experiences severe winter conditions, ice cover begins to form in late October and reaches its maximum extent by March.1

While coastal areas become completely locked in ice, the open sea is characterized by floating ice floes that obstruct shipping routes. These conditions necessitate careful navigation, as the ice creates a hazardous environment for vessels attempting to connect the ports of eastern Russia. Beyond the presence of ice, navigation in the region is further complicated by other environmental perils, including dense summer fog, strong ocean currents, and the presence of submerged rocks.1