Indeed and this is also contentious are you maybe are aware. USA didn't want 1/2 million estmated soldiers killed invading and occupying mainland Japan, a defeated Japan didn't want Soviet occupation, Patton and others advised on the threat of Stalin, Churchill was weak and it was the start of the end of most of the British empire... The list and possible outcomes goes on, the what if's! But like I said today is not dissimilar but let's stick to gear wars... Pentax KGB vs traitor meThis is explained in the Potsdam Museum in Germany. The issue Truman had is that Stalin was anxious to join the war in Japan, as the war in Germany was about wrapped up. Truman and the allies fighting in the Pacific wanted none of this, they wanted to keep Russia out of Japan. So he described the bomb and said it would end the war and he would not need any help from Russia. Part of the logic for the timing of the bombs was because of this.