The Yalta Conference in February 1945 brought together the leaders of the United States, United Kingdom, and Soviet Union to plan for the post-war world as World War II continued. There was a focus on Poland, as Stalin wanted to ensure it became communist and friendly to the USSR, while Churchill and Roosevelt wanted it to be democratic. Roosevelt was ill and trusted Stalin, while Churchill distrusted Stalin and was worried about Soviet influence spreading across Eastern Europe. Poland was important because it was the largest country in Eastern Europe and there were competing Polish governments-in-exile that had different views on Soviet control.