Roosevelt was determined to stop Stalin from taking over Eastern Europe. He thought they finally had an agreement on Poland. Before Roosevelt died, he realized that Stalin had broken his agreement.

I think there are telegrams that may or may not be available, which indicated that I very much had in mind the need to give Europe substantial aid after the war, after Lend-Lease was over.

I think Stalin was afraid of Roosevelt. Whenever Roosevelt spoke, he sort of watched him with a certain awe. He was afraid of Roosevelt's influence in the world.

W. Averell Harriman Quotes