By 16 July 1945, however, the Americans had successfully tested their A-bomb at Alamogordo. It had also become clear that the Japanese would fight for every inch of their islands, and President Truman saw nuclear weapons as a desirable means of avoiding massive loss of lives among the invading American forces. He no longer saw any reason to encourage Soviet military intervention. Having seen how Stalin had tricked Roosevelt over Berlin, he was not going to be fooled again. American policy towards the USSR was in any case getting steadily sterner. What Truman would not do, though, was retract Roosevelt’s specific promises at Yalta to Stalin about China and Japan: he did not want to set a precedent for breaking inter-Allied agreements. Stalin did not know this. He had yet to test Truman’s sincerity as a negotiating partner. He sensed that, unless the Red Army intervened fast, the Americans might well deny him the Kurile Islands after Japan’s defeat. Stalin wanted total security for the USSR: ‘We are closed up. We have no outlet. Japan should be kept vulnerable from all sides, north, west, south, east. Then she will keep quiet’11
The race for Berlin gave way to the race for the Kuriles.Stalin, Truman and Churchill came together at the Potsdam Conference from 17 July. This time there was no argy-bargy about the choice of venue; the leaders of the Big Three wanted to savour victory at the centre of the fallen Third Reich. While Stalin took his train from Moscow, Truman made the long trip across the Atlantic and joined Stalin and Churchill in Berlin. Meetings were held in the Cecilienhof. The wartime personal partnership was already over, with Roosevelt’s replacement by Truman. Perhaps Roosevelt would anyway have ceased to indulge Stalin in the light of American global ambitions after the world war. Certainly Truman already felt this way.
The other great change in the Big Three occurred in the course of the Potsdam Conference. On 26 July the British elections swept the Labour party to power. Churchill ceded his place at the negotiations to his Deputy Prime Minister Clement Attlee. The new government was no gentler on Stalin than Churchill, and the Potsdam Conference turned into a trial of strength between the USA and the USSR with the British regularly supporting the Americans. Several topics were difficult: the Japanese campaign; the peace terms in Europe; and Poland’s frontiers and government. The Americans, buoyed by their monopoly of nuclear-weapons technology, were no longer eager for Soviet military assistance in the Far East. This time it was Stalin who stressed the need for the USSR’s participation. On Europe there was agreement on the Allies’ demarcation of zones of occupation. But wrangles remained. It was decided to hand over the details for resolution by the Council of Foreign Ministers. Poland, though, could not be pushed aside. The Conference at Stalin’s insistence listened to the arguments of the USSR-sponsored Provisional Government. The Americans and British complained repeatedly about Soviet manipulation and about political repression in Warsaw. The Western Allies expected Stalin to respect Polish independence and to foster democratic reform.
Both Truman and Stalin knew that the American A-bomb was ready for use, but Truman did not know that Stalin knew. In fact Soviet espionage had reported accurately to Moscow, and on this occasion Stalin did not disbelieve his agents. When Truman informed him about the American technological advance, Stalin had prepared himself to be unperturbed — and Truman was astounded by his sangfroid. In the same period Stalin buttonholed his commanders, urging them to bring forward the Soviet offensive against Japan. But technical reasons obstructed any change in schedule, and Stalin restrained an inclination to insist on the impossible. Increasingly the Western Allies ignored him. Truman, Churchill and Chiang Kai-shek issued their own ultimatum to the Japanese government from Potsdam. Nobody consulted Stalin.12