I am aware of how far Hanoi is from Vladivostok; Japan and China are kind of in the way. I was suggesting that the Soviets might see advantages to keeping Japan in the way, and serious disadvantages to, say, Japan at any point folding to Entente pressure, or losing a war against the Entente, and giving the Entente influence much closer to Vladivostok. It seems better for the Soviets that Japan not be too weak (though certainly not too strong, either).
I'd imagine the Soviets would be quite willing to drive the Japanese off of mainland Asia[1] if they could also ensure their guy wins out in China (although whether "their guy" would be Mao or Chiang would probably be something-to-be-determined by the subsequent Civil War). China as a modernizing partner would be more then able to counteract a Japan which shifts to a more pro-Entente extent[2]... on the caveat they could be kept loyal (which is why a Sino-Soviet split would be... problematic).
[1]Taking the war to the Japanese home islands is obviously a laughable possibility given even a cursory comparison between the IJN and the Soviet Pacific Fleet.
[2]Although given the lack of OTL's Pacific War, I can't see the Japanese moderating their ambitions that they would be comfortable Entente allies for quite a while.
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