Try? Yes. Succeed, no. He's already got Manchuria, the Kurils, half to all of Korea and half of Europe. At that point, I think Stalin gets told to go pound sand
With the war ongoing there's nothing to stop the Soviets from advancing further other than the Japanese, the Americans can't realistically start protesting about an ally taking enemy territory. There was even a contingency agreed upon at the Yalta conference which the Soviets could cite that acknowledged they might have to go beyond their designated zone of operations if the war against Japan continued.
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