I think one should not under-estimate the bad feeling that the Russian have towards the Japanese due to a string of Russian defeats during the Russo-Japanese war along with the disputes over several islands. Nor the Japanese feelings towards the Russian for the capture of those islands, the dispute still causes tension 60 years after the Russians seized them.
I'm not saying that alone would cause the Soviet Union to use nuclear weapons against Japan but it would probably make any decision to attack Japan a little easier.
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