Holy See–Serbia relations
Holy See and Serbia maintain diplomatic relations established between the Holy See and Kingdom of Yugoslavia in 1919. From 1919 to 2006, the Holy See maintained relations with the Kingdom of Yugoslavia, the Socialist Federal Republic of Yugoslavia (SFRY), and the Federal Republic of Yugoslavia (FRY) (later Serbia and Montenegro), of which Serbia is considered shared (SFRY) or sole (FRY) legal successor.
Source: Wikipedia — Holy See–Serbia relations (CC BY-SA 4.0)