Conversely, if the Reds running the show in the Roosevelt administration hadn't given Stalin that giant idiotic freebie, millions and millions of Asians would still be alive who died in the Cultural Revolution, the Indochina Wars, and North Korea. What value did the Soviet declaration of war really have for us? NONE! They had no capability nor will to jump into an amphibious invasion of the Home Islands, and with our total sea dominance, the Japanese Army in China was a beached whale, totally unable to intervene in any effective way with Downfall, so a Soviet attack on them added nothing to our operations in the Home Islands. It gave Stalin unimpeded control over, access to, and ideological domination of hundreds of millions of Asians and cost perhaps a hundred million lives over the next fifty years of troubles, all for a deal Rosie's Reds made for something that was of no value to us.
The invasion, had it gone off, would have brought horrors to the Japanese civilian population that make the results of the two atomic bomb attacks pale by comparison, there were active plans to use lethal chemical weapons on Japanese cities on a very large scale if the level of resistance planned by Tojo and company materialized.