Serbia–Albania
The Kingdom of Serbs, Croats and Slovenes was formally renamed the Kingdom of Yugoslavia in 1929. During the Second World War, communist Albania and Yugoslavia worked together to rid themselves of fascist occupation. However, during the Cold War Albania broke relations with the Yugoslav communists, because its leader Enver Hoxha remained loyal to the Soviet Union under Stalin. The Yugoslav Wars of the 1990s saw the dissolution of Yugoslavia and the formation of the State Union of Serbia and Montenegro. During the conflict, Albania broadly supported NATO's bombing of Kosovo (then a Serbian province), which resulted in Serbia and Montenegro breaking off diplomatic relations with Albania. Tension still simmers in the 21st century, with Albania insisting that Kosovo's independence remains "undeniable," a belief Serbia regards as provocation.