During World War II, in November 1943, Joseph Stalin, Winston Churchill and Franklin D. Roosevelt met together in Teheran, Iran, to discuss military strategy and post-war Europe, in a conference codenamed Eureka. Ever since the Soviet Union had entered the war, Stalin had been demanding that the Allies open-up a second front in Europe. Stalin, who always favoured in offensive strategy, believed that there were political, as well as military reasons for the Allies’ failure to open up a second front in Europe. Stalin was still highly suspicious of Winston Churchill and Franklin D. Roosevelt and was worried about them signing a peace agreement with Adolf Hitler. The foreign policies of the capitalist countries since the October Revolution had convinced Stalin that their main objective was the destruction of the communist system in the Soviet Union. Stalin was fully aware that if Britain and the USA withdrew from the war, the Red Army would have great difficulty in dealing with Germany on its own.
At Teheran, Joseph Stalin reminded Churchill and Roosevelt of a previous promise of landing troops in Western Europe in 1942. Later they postponed it to the spring of 1943. Stalin complained that it was now November and there was still no sign of an allied invasion of France. After lengthy discussions, it was agreed that the Allies would mount a major offensive in the spring of 1944. Roosevelt and Churchill also accepted Stalin’s demands regarding Poland’s post-war boundaries, which would give the Soviets Lwów, Wilno, and Poland’s eastern Kresy territory occupied by Stalin under his 1939 alliance with Nazi Germany. Churchill proposed that Poland, in return, be compensated with a corresponding slice of Germany. They all agreed that they would continue to make available to the Government of Iran economic assistance as may be possible, having regard to the heavy demands made upon them by their world-wide military operations.
The D-Day landings in June, 1944 took the pressure off the Red Army and from that date they made steady progress into territory held by Germany bringing World war II to end.