By George,
a shallower memory for you old chap. The Yanks only dropped the big-one on Japan, so that the Japanese nation would surrender to the US, not the Russians - who by July 1945 had already negotiated a conditional surrender with Japan.
The Yanks at the Potsdam Conference (17 July to 2 Aug 1945 - US, UK and Russ in attendance) insisted they wanted to have Emperor Hirohito's head on a block as a war criminal - and there was no negotiation.
(Note 1 - the US had detonated their 1st 'device' at Trinity, New Mexico, on the 16 July 1945. Truman had been advised via telegram as he sailed to Europe for the conference and was desperate to do a bit of willy-waving on the international stage)
(Note 2 - the US alluded to their device stating they "had a weapon of awesome power" no doubt burning a hole in their pocket - as it cost $1 billion to produce)
But when Japan finally did surrender - the US let Hirohito remain as emperor, without trialling him for war-crimes, for "the stability of the nation". Or was it so Hirohito could allow the US to put it's air bases, listening devices, missiles etc on Japaese soil - and - get the Japanese nation to work like slaves to produce cheap good's for the Yanks to buy?
If the Japanese had surrendered to the Russians in 1945, the Yanks would not have been watching the lunar landings in 1969 on Sony TV's.....
Best Regards,
N1 Vibes