Thus, Churchill was drawn into Stalin`s game of manipulation behind the scenes to save the „special relationship“ he had with Roosevelt, which he saw as threatened by Roosevelt`s susceptibility to the combination of Stalin`s private charm offensive and public frowns. Stalin had none of this – his only concern was to set the May 1944 date for „Overlord,“ appoint a commander-in-chief to execute him, and commit to a support landing in southern France. After intensive staff evaluations and debates, the first and final points were agreed, so that the appointment of a C-in-C was to be decided in Cairo the following month (Roosevelt successfully promoted his preferred candidate for the position, General Dwight D. Eisenhower). Tehran, Iran, was chosen as the venue for the talks, mainly because of its strategic importance to the allies. The United States was able to supply the Soviets via Iran when Germany controlled most of Europe, the Balkans, and North Africa, and German submarine attacks on Allied ships in the Atlantic and North Sea made transportation dangerous. When First Lady Eleanor and the couple`s daughter, Anna, expressed a desire to accompany Roosevelt to Iran, he flatly refused, saying there would be no women at the pre-conference between him and Churchill in Cairo or at the meeting in Tehran. Eleanor and Anna were furious when they later learned that Churchill`s wife and Mrs. Chiang Kai Shek from China had made the trip. The Turkish president consulted Roosevelt and Churchill at the Cairo conference in November 1943 and promised to go to war when his country was fully armed. In August 1944, Turkey severed relations with Germany. In February 1945, Turkey declared war on Germany and Japan, which may have been a symbolic step that allowed Turkey to join the future United Nations.   These tensions manifested themselves in the most important issue discussed by the Big Three in Tehran – the nature and timing of the beginning of a „second front“ in northwestern Europe, codenamed „Overlord,“ the initial planning of which had been initiated at the Casablanca Conference in January 1943.
As soon as the German-Soviet War broke out in June 1941, Churchill offered his help to the Soviets, and on July 12, 1941, an agreement to that effect was signed.  However, in an oral radio program announcing the alliance with the USSR, Churchill reminded listeners that this alliance would not change his stance against communism.  Delegations had traveled between London and Moscow to organize the implementation of this support, and when the United States entered the war in December 1941, the delegations also met in Washington. .