Josep Borrell, the EU’s top diplomat, has pressured Kosovo to establish a Serb-only association of municipalities as was formerly agreed between Kosovo and Serbia in 2013.

During a press conference on Tuesday, Kosovo’s Prime Minister Albin Kurti said the agreement serves Serbia and not Kosovo. Borrell, who attended the press conference, responded by saying he is not in the service of either Pristina or Belgrade. He then said this agreement is more important than the others that have not been implemented.

The 2013 agreement would see the establishment of a Serb-only association that would echo the structure of those in Bosnia and Herzegovina. Serbia refuses to accept Kosovo as a sovereign state, and Kosovo fears that such an agreement will undermine its sovereignty.

Kosovo’s Constitutional Court ruled that the agreement was unconstitutional in 2015. Its reasoning said that the association can not have executive rights similar or equal to that of the government.

Prime Minister Kurti has been clear that his government will not establish a single ethnicity association of Serb municipalities, stating that it is dysfunctional.