From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'be part of', Sentence: '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 .'
part