Input: Relationship: 'be part of', Argument/Subject 1: 'kosovo', Argument/Subject 2: 'serbium'

Answer: Both NATO and the UN continue formally to recognise Kosovo as a part of Serbia although Serbia is not allowed to exercise any sovereignty over it , as since 1999 much of the Serb population have departed and local Albanians are reluctant to see Serbian sovereignty in Kosovo restored in practice .