Three leaders who had never met in person finally sit down, and set a date
What happened
From 28 November to 1 December 1943, Roosevelt, Churchill, and Stalin met together in person for the first time, at the Soviet embassy in Tehran. Every earlier wartime meeting between the three had been bilateral or by telegram, making Tehran the first time all three Big Three leaders sat at the same table. Stalin had pushed for over a year for a second front in France to relieve pressure on the Red Army, and at Tehran Roosevelt and Churchill committed to launching the invasion of northern France by May 1944, with Stalin agreeing to time a coordinated Soviet offensive to the same window. The three leaders also began dividing the postwar world privately: Stalin agreed the USSR would enter the war against Japan once Germany fell, in exchange for the Kuril Islands, southern Sakhalin, and access to Manchurian ports, concessions made without any Chinese representative present.
Why it matters
A firm May 1944 date, rather than a vague future promise, is what let Allied planners actually schedule the invasion and gave Stalin concrete reason to keep trusting a second front was really coming rather than suspecting the Western Allies of deliberately bleeding the Soviets dry on the Eastern Front while staying safe themselves. The Manchurian and Kuril concessions, agreed here and finalized later at Yalta, were made about Chinese and Japanese territory without a single Chinese representative in the room.
How we know
The US State Department's Office of the Historian publishes the Tehran Conference record as part of its official Foreign Relations of the United States series, documenting both the May 1944 invasion commitment and the specific territorial concessions, Kuril Islands, southern Sakhalin, and the ports of Dairen and Port Arthur, that Roosevelt agreed to in exchange for Stalin's promised entry into the Pacific war.
Sources
- US Department of State, Office of the Historian. The Tehran Conference, 1943 · Reputable sourcehistory.state.gov · The domain "history.state.gov" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
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