The issue has been regarded as the most intractable in the Balkans since NATO bombers forced Yugoslav security forces to withdraw from Kosovo in 1999 , halting what international war crimes prosecutors say was a brutal campaign to force ethnic Albanians to flee .
Balkans /location/location/contains Kosovo
DT NN VBZ VBN VBN IN DT RBS JJ IN DT NNP IN NNP NNS VBD JJ NN NNS TO VB IN NNP IN CD , VBG WP JJ NN NNS NNS VBP VBD DT JJ NN TO VB JJ NNS TO VB .
Balkans
LOCATION
Kosovo
LOCATION
/location/location/contains