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Consider the following map.

For those who are slightly above knowledgable in WWII history in the Pacific we recognise the following as an alternate plan to divide Japan that never got through. The reasons why are numerous: it was conceding too much to the Soviets, Japan was going to serve well as a buffer between the US and potentially all-Communist mainland Far East, and the Republic of China was falling apart.

But for argument's sake let's say it went through. Like OTL Korea Japan is partitioned along these lines, elections are held in 1948 and separate governments are formed. Soviet troops begin training the Japanese and the Americans do the same in the south. The Soviets pull out from occupying Tokyo, so none of their assets are endangered.

Let us also assume that both sides were extremely belligerent, similar to OTL Rhee vs. Kim - constant border clashes, minor scuffles, and a generally escalated atmosphere. The Soviets also send large amounts of supplies to Hokkaido and northern Honshu, both for defence against American ships and preparing for war against the south.

(we'll also assume that Korea is left whole and neutral in this scenario.)

Let's say either side started a war. Troops begin pouring in from both sides and it's becoming a major war.

The main question is this: how possible is logistical support? Won't the USN be able to cut off Soviet supply fleets? How easily can either side launch amphibious attacks? How long can North Japan wage war without supplies from the Soviets?
Questions and comments both welcome.
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