The term 'SITE OF THE 1945 BIG THREE MEETING' refers to the city of Yalta, which is located in the Crimea region of Ukraine. In 1945, Yalta was the site of a meeting between the leaders of the three major Allied powers during World War II: the United States, the United Kingdom, and the Soviet Union. This meeting, known as the Yalta Conference, was held from February 4th to 11th and resulted in the establishment of the United Nations.