What concessions were made to the soviet union at the yalta conference?

At the Yalta Conference in February 1945, several concessions were made to the Soviet Union, primarily to secure their participation in the war against Japan and to facilitate post-war cooperation. The Allies agreed to recognize Soviet claims to territories lost in World War I and to grant the USSR influence over Eastern Europe, including a sphere of influence in Poland. Additionally, it was agreed that the Soviet Union would join the United Nations and would be given a permanent seat on the Security Council, enhancing its global standing. These concessions aimed to foster a sense of cooperation among the Allied powers and to lay the groundwork for post-war peace.