How did Stalin work with roosevelt and churchill to achieve goals?

Stalin collaborated with Roosevelt and Churchill through a series of wartime conferences, such as those in Tehran and Yalta, where they coordinated military strategies and discussed post-war plans. He leveraged the Allies' need for Soviet military support against Nazi Germany to secure concessions, including territorial gains in Eastern Europe. Additionally, Stalin's participation in the Allied leadership helped legitimize the USSR's role in the post-war order, ensuring a significant influence in shaping the future of Europe. Overall, their cooperation was marked by a blend of pragmatism and mutual dependency in the fight against a common enemy.