Marshal Josef Stalin makes a toast to Churchill on 30 November 1943, the British premier’s 69th birthday, during the Tehran Conference. Stalin was a difficult ally and relations were not always this friendly. With Russia taking the brunt of the war against Germany, Stalin had aggressively insisted on an invasion of northern France. Churchill resisted. He believed that any premature ‘Second Front’ was likely to fail. At Tehran, a date was finally set for June 1944.