Truman was much more suspicious of the Soviets than Roosevelt and became increasingly suspicious of Stalin's intentions. Truman and his advisers saw Soviet actions in Eastern Europe as aggressive expansionism that was incompatible with the agreements that Stalin had committed to at Yalta in February. In addition, Truman became aware of possible complications elsewhere when Stalin objected to Churchill's proposal for an Allied withdrawal from Iran ahead of the schedule agreed at the Tehran Conference. The Potsdam Conference was the only time that Truman met Stalin in person.