Soviet declaration of war a month before bomb available

WI either VE day were earlier or there was some technical delay so that Stalin's campaign against Japan started before the bomb,

I have heard the view that the Soviet declaration of war made a big difference in allowing the surrender,

If Japan had not surrendered how much difference would it make to the facts on the ground at the end of the war
 
In that case the Red Army takes Korea. Agreement or no agreement, Stalin will try to make the whole peninsula a Soviet satellite.
 
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