Did Russia miss a chance to conquer Hokkaido by not attacking Japan earlier?

Did Russia miss a chance to conquer Hokkaido by not attacking Japan earlier, before they finished off Nazi Germany?
Did the freezing of water in Strait Perousse give Russia a chance to attack Hokkaido from Sakhalin after conquering south Sakhalin, if Russia attacked in winter?
By december 1944, it was clear Nazi Germany was going to lose, so Russia could have afforded to sent part of the Russian army eastward.

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No. The IJN even at its weakest was superior to the Sovet Far East Fleet. The Soviets never had a credible way to implement an amphibious operation in the Far East. Similary the USN determined that the postwar occupation woulld be American for the same reason.

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Good point, even when they attacked the Kuriles after the surrender with US lend landing craft it became a stalemate until Hiro Hito intervened because of fear of resumed bombings

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