Saved Japan from Soviet occupation in the North.
At the cost of surrendering territory to the Soviets (half of Sakhalin; the Kurile Islands).
At the close of WWII, the Soviets grabbed territory from virtually every combatant nation - whether friend or foe - which it bordered.
Regards,
“Saved Japan from Soviet occupation in the North”
The Soviets launched their Manchurian campaign on 09AUG45. There is good reason to believe that had a larger impact on the decision to surrender than the second bomb.