<P> The invasion of France on 6 June 1944 took place about as planned, and the supporting invasion of southern France also took place (Operation Dragoon). The Soviets launched a major offensive against the Germans on 22 June 1944 (Operation Bagration). </P> <P> According to Soviet reports, German agents planned to kill the Big Three leaders at the Tehran Conference, but called off the assassination while it was still in the planning stage . Western intelligence dismissed the existence of this plot . Otto Skorzeny, the alleged leader of the operation, claimed that Hitler had dismissed the idea as unworkable before planning had even begun . Nevertheless, the topic continues to be a theme of certain Russian historians . </P>

At the tehran conference the big three agreed on which overriding goal