Japan w/ all Sakhalin post-WW2?

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The way it happens doesn't really matter, (say Japan seizes it during Op Barbarossa but surrenders to the allies before Russia takes I back in '45)
but if Japan were emerge post-War with all of Sakhalin under his control, what sort of economic strength would the nation have compared to OTL?

More specially, how would the large amounts of oil in northern Sakhalin effect the diversification the Japanese economy?
 
You'd want to go a little further than that, because Japan violating the Soviet-Japanaese neutrality pact would only end very badly for Japan. There are several ways to go about it though.

Perhaps if the Japanese agreed to take all of Sakhalin in exchange for reparations in the Treaty of Portsmouth after the Russo-Japanese War, and subsequently surrendered before the Soviet amphibious operations were ready to invade Sakhalin, the Japanese could retain it. But the latter is a huge maybe, because unconditional surrender means exactly that. You don't get to decide which islands you get to keep. That the US restored Japanese rule over its original islands was a stroke of good fortune. Don't expect the Soviets to be anywhere near as generous, even with a communist Japan.
 
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