Tehran Conference in the context of "Surrender of Japan"

The Socialist Federal Republic of Yugoslavia (commonly abbreviated as SFRY or SFR Yugoslavia), known from 1945 to 1963 as the Federal People's Republic of Yugoslavia, commonly referred to as Socialist Yugoslavia or simply Yugoslavia, was a country in Central and Southeast Europe. It was established in 1945, following World War II, and lasted until 1992, dissolving amid the onset of the Yugoslav Wars. Spanning an area of 255,804 square kilometres (98,766 sq mi) in the Balkans, Yugoslavia was bordered by the Adriatic Sea and Italy to the west, Austria and Hungary to the north, Bulgaria and Romania to the east, and Albania and Greece to the south. It was a one-party socialist state and federation governed by the League of Communists of Yugoslavia, and had six constituent republics: Bosnia and Herzegovina, Croatia, Macedonia, Montenegro, Serbia, and Slovenia. Within Serbia was the Yugoslav capital city of Belgrade as well as two autonomous Yugoslav provinces: Kosovo and Vojvodina.

The country emerged as Democratic Federal Yugoslavia on 29 November 1943, during the second session of the Anti-Fascist Council for the National Liberation of Yugoslavia midst World War II in Yugoslavia. Recognised by the Allies of World War II at the Tehran Conference as the legal successor state to Kingdom of Yugoslavia, it was a provisionally governed state formed to unite the Yugoslav resistance movement. Following the country's liberation, King Peter II was deposed, the monarchical rule was ended, and on 29 November 1945, the Federal People's Republic of Yugoslavia was proclaimed. Led by Josip Broz Tito, the new communist government sided with the Eastern Bloc at the beginning of the Cold War but pursued a policy of neutrality following the 1948 Tito–Stalin split; it became a founding member of the Non-Aligned Movement, and transitioned from a command economy to market-based socialism. The country was renamed Socialist Federal Republic of Yugoslavia in 1963.

The "Four Policemen" was a postwar council with the Big Four that U.S. president Franklin D. Roosevelt proposed as a guarantor of world peace. Their members were called the Four Powers during World War II and were the four major Allies of World War II: the United Kingdom, the Soviet Union, the United States, and the Republic of China. Roosevelt repeatedly used the term "Four Policemen" starting in 1942.

The Four Policemen would be responsible for keeping order within their spheres of influence: Britain in its empire and Western Europe, the Soviet Union in Eastern Europe and the central Eurasian landmass, China in East Asia and the Western Pacific; and the United States in the Western Hemisphere. As a preventive measure against new wars, countries other than the Four Policemen were to be disarmed. Only the Four Policemen would be allowed to possess any weapons more powerful than a rifle.

Western betrayal is the view that the United Kingdom, France and the United States failed to meet their legal, diplomatic, military and moral obligations to the Czechoslovaks and Poles before, during and after World War II. It also sometimes refers to the treatment of other Central and Eastern European states by those three nations.

The concept primarily derives from several events, including British and French appeasement towards Nazi Germany during its 1938 occupation of Czechoslovakia and the perceived failure of Britain and France to adequately assist the Poles during the German invasion of Poland in 1939. It also derives from concessions made by American and British political leaders to the Soviet Union during the Tehran, Yalta, and Potsdam conferences and their limited response during the 1944 Warsaw Uprising along with post-war events, which allocated Poland to the Soviet sphere of influence as part of the Eastern Bloc.

Lwów Voivodeship (Polish: Województwo lwowskie) was an administrative unit of interwar Poland (1918–1939). Because of the Nazi invasion of Poland in accordance with the secret Molotov–Ribbentrop Pact, it became occupied by both the Wehrmacht and the Red Army in September 1939. Following the conquest of Poland however, the Polish underground administration existed there until August 1944. Only around half of the Voivodeship was returned to Poland after the war ended. It was split diagonally just east of Przemyśl; with its eastern half, including Lwów itself, ceded to the Ukrainian SSR at the insistence of Joseph Stalin during the Tehran Conference confirmed (as not negotiable) at the Yalta Conference of 1945.

Democratic Federal Yugoslavia, also known as Democratic Federative Yugoslavia (DF Yugoslavia or DFY), was a provisional state established during World War II on 29 November 1943 through the Second Session of the Anti-Fascist Council for the National Liberation of Yugoslavia (AVNOJ). The National Committee for the Liberation of Yugoslavia (NKOJ) was its original executive body. Throughout its existence it was governed by Marshal Josip Broz Tito as prime minister.

It was recognized by the Allies at the Tehran Conference, along with the AVNOJ as its deliberative body. The Yugoslav government-in-exile of King Peter II in London, partly due to pressure from the United Kingdom, recognized the AVNOJ government with the Treaty of Vis, signed on 16 June 1944 between the prime minister of the government-in-exile, Ivan Šubašić, and Tito. With the Treaty of Vis, the government-in-exile and the NKOJ agreed to merge into a provisional government as soon as possible. The form of the new government was agreed upon in a second Tito–Šubašić agreement signed on 1 November 1944 in the recently liberated Yugoslav capital of Belgrade. This Yugoslavia became one of the founding members of the United Nations upon the signing of the UN Charter in October 1945.