Note that I'd expect to see the influence of ice floe in the Bering Sea (=from Alaska to Russia, the most used channel should change latitude depending on the i

Note that I'd expect to see the influence of ice floe in the Bering Sea (=from Alaska to Russia, the most used channel should change latitude depending on the ice coverage in winter), but I don't see where the ice limit could be. Do they have icebreakers to keep the channel open?