At the Yalta Conference, held on the Crimean coast from February 4 to 11, 1945, the three prime ministers met in person for the second time. With a view to the Allied victory in the war in Europe, discussions focused on the reorganization of the continent after the end of the war. The Allies reaffirmed their intention to continue Germany`s unconditional surrender and then divide the country into zones of occupation. Other topics discussed included denazification and punishment of war criminals; German reparations; the form of the future international organization to replace the League of Nations – which would become the UN; the voting procedures of such a body; and the war in Asia. In retrospect, many historians have seen Kanta as one of the war meetings with the most controversial legacy, as compromises were found – especially with regard to Eastern Europe. I hope that Parliament will feel that this hope has been greatly strengthened by our meeting in Crimea. The ties between the three great powers and their mutual understanding have developed. The United States has entered deeply and constructively into the life and salvation of Europe. All three of us have heard far-reaching commitments, both practical and solemn.
Together, we have the undeniable power to lead the world to prosperity, freedom and happiness. The great powers must try to serve, not to govern. In addition, the Soviets promised to allow free elections in all parts of Eastern Europe liberated from Nazi occupation, including Czechoslovakia, Hungary, Romania and Bulgaria. In return, the United States and Britain agreed that the future governments of the Eastern European countries bordering the Soviet Union should be „friendly“ with the Soviet regime, satisfying Stalin`s desire for a zone of influence as a buffer against future conflicts in Europe. The Tehran Conference, held between November 28 and December 1, 1943, was the first conference between the three main allies (the Soviet Union, the United States, and the United Kingdom) in which Roosevelt participated, as he did not attend the Moscow Conference in August 1942. It was followed by the Cairo Conference, followed by the Yalta Conference and the Potsdam Conference. The main debate focused on the opening of a second front in Western Europe and Soviet participation in the Pacific front. Roosevelt and Stalin spent much of the conference convincing Churchill to engage in an invasion of France, which finally succeeded on November 30, when Roosevelt announced over lunch that they would launch the invasion in May 1944.  This pleased Stalin, who had urged his allies to open a new front in the West in order to reduce the pressure on his troops. This decision is perhaps the most critical that emerges from this conference, since the desired effect of the relief of Soviet troops was achieved, leading to a Soviet rally and an advance towards Germany, a flood that Hitler could not stop.
At a meeting in the City of Yalta in Russian Crimea from February 4 to 11, Roosevelt, Churchill and Stalin each arrived with their own conference agendas. For Stalin, the main objectives were post-war economic aid to Russia and the recognition of a Soviet sphere of influence in Eastern Europe by the United States and Britain. Churchill had the protection of the British Empire in the first place, but also wanted to clarify Germany`s post-war status. Roosevelt`s goals included a consensus on the creation of the United Nations and Soviet approval to go to war with Japan after Hitler`s defeat. None of them left Yalta completely satisfied. There was no final determination of financial assistance to Russia. Many questions concerning Germany have been postponed for further discussion. As for the United Nations, Stalin wanted the 16 Soviet republics to be represented in the General Assembly, but settled for three (the Soviet Union as a whole, Belarus and Ukraine). However, the Soviets agreed to participate in the war against Japan 90 days after the defeat of Hitler`s Germany. Allied leaders also decided that Germany should be completely demilitarized and „de-Nazified“ and that it would assume some responsibility for post-war reparations, but not just responsibility. Churchill proposed to Stalin a move west of Poland that accepted Stalin, giving the Poles industrialized German lands to the west and swamps to the east, while providing the Soviet Union with a territorial buffer against the invasion. Churchill`s plan provided for a border along the Oder and Eastern Neisse rivers, which, in Churchill`s view, granted Poland fair compensation for the eastern border areas.
 Stalin was reluctant to leave Moscow and did not want to risk flying, while Roosevelt was physically disabled and found travel difficult. Churchill was an avid traveler and had already met Roosevelt five times in North America and twice in Africa as part of an ongoing series of lectures on the war, and had already held two meetings with Stalin in Moscow.  To organize this meeting if necessary, Roosevelt tried to persuade Stalin to go to Cairo. Stalin rejected this offer and also offered to meet in Baghdad or Basra, and finally agreed to meet in Tehran in November 1943.  According to Soviet reports, German agents had planned to kill the three major leaders at the Tehran conference, but called off the assassination while it was still in the planning phase. The NKVD, the USSR`s counterintelligence unit, first informed Mike Reilly, Roosevelt`s security chief, of the alleged assassination days before Roosevelt arrived in Tehran. Reilly had traveled to Tehran a few days earlier to assess security concerns and explore possible routes from Cairo to Tehran. Shortly before his return to Cairo, the NKVD informed him that dozens of Germans had been parachuted into Tehran the day before. The NKVD suspected that German agents were planning to kill the three major leaders at the Tehran conference.  The leaders then turned to the conditions under which the Western Allies would open a new front by invading northern France (Operation Overlord), as Stalin had urged them to do since 1941. Until then, Churchill had advocated the expansion of joint operations by British, American, and Commonwealth forces in the Mediterranean, as the opening of a new Western Front had been physically impossible due to a lack of sea routes and the Mediterranean and Italy remained viable targets for 1943.
It was agreed that Operation Overlord would be launched by American and British forces in May 1944 and that Stalin would support the Allies with a major simultaneous offensive on the German Eastern Front (Operation Bagration) to divert German forces from northern France.  On August 23, 1939 – just before World War II (1939-45) broke out in Europe – the enemies of Nazi Germany and the Soviet Union surprised the world with the signing of the German-Soviet Non-Aggression Pact, in which the two countries agreed not to take military action against each other in order to . Although Stalin accepted the above agreements, he dominated the conference. He used the prestige of the Soviet victory at the Battle of Stalingrad to impose his will. Roosevelt tried to cope with Stalin`s onslaught of demands, but could do little but appease Stalin. Churchill advocated the invasion of Italy in 1943 and then Overlord in 1944, on the grounds that Overlord was physically impossible in 1943 due to lack of navigation and that it would be unthinkable to do anything bigger until it could be launched.  In addition, the Soviet Union was obliged to commit to supporting Turkey if that country entered the war. Roosevelt, Churchill and Stalin agreed that it would also be highly desirable for Turkey to side with the Allies before the end of the year. The central objective of the Tehran conference was to plan the final strategy of the war against Nazi Germany and its allies, and the main discussion focused on the opening of a second front in Western Europe (D-Day). Relations with Turkey and Iran were discussed at the conference. What was the purpose of the Yalta Conference? When was it? to decide what would happen to Europe and Germany after the liberation of the countries from the Nazi regime.
Stalin offered to execute 50,000 to 100,000 German officers so that Germany could not plan another war. Roosevelt, who believed that Stalin was not serious, joked that „maybe 49,000 would be enough.“ Churchill, however, was outraged and condemned „the cold-blooded execution of soldiers who fought for their country.“ He said only war criminals should be tried according to the Moscow document he himself had written. He burst out of the room but was brought back by Stalin, who said he was making jokes. Churchill was happy that Stalin had given in, but thought Stalin would test the water.  At the Tehran Conference, the following agreements were reached: In exchange for their support for the Pacific War, the other Allies agreed that the Soviet Union would take control of japanese territory it had lost in the Russo-Japanese War of 1904-05, including southern Sakhalin (Karafuto) and the Kuril Islands. Stalin also demanded that the United States diplomatically recognize Mongolia`s independence from China; Founded in 1924, the Mongolian People`s Republic was a Soviet satellite. There was a common view among the participants that Germany should be divided after the war, with the parties differing on the number of divisions needed to neutralize its ability to wage war.  While the proposed figures were very different and never materialized, the powers effectively divided modern Germany into two parts until the end of the Cold War. Over dinner, Churchill asked Stalin about his post-war territorial ambitions, to which Stalin replied: „It is not currently necessary to talk about Soviet desires, but when the time comes we will talk.“