How did Stalin change his position between the meeting at Yalta in February 1945 and the meeting in Potsdam later that year?

Question

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At the Yalta Conference in February 1945, Stalin had agreed to hold free elections in Poland after the war, but by the time of the Potsdam Conference in July, he had changed his position and refused to permit elections in Soviet-occupied Poland. This was a significant change that undermined the trust between the Allies and foreshadowed future tensions in the Cold War.

How Did Stalin Change His Position Between the Meeting at Yalta