Detailed Instructions: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Q: Sentence: 'Kosovo is still technically a semi-autonomous province of Serbia , but since 1999 it has been occupied by NATO and UN troops and governed under a United Nations Mandate .', Argument/Subject 1: 'kosovo', Argument/Subject 2: 'serbium'
A:
be province in