Meanwhile the EU's rule-of-law mission, EULEX, is crucial while Kosovo's own judiciary is in its infancy.
Yet early last month the EULEX mission at last deployed across the whole country.
But another central part of the EU project is effectively grounded for the same reason as Eulex.
Nato leads some 6, 000 international peacekeeping troops stationed in Kosovo, while the EU runs a security and policing operation known as Eulex.
The international trafficking case was tried by Eulex because of the involvement of two government ministers, reports BBC Balkans correspondent Guy de Launey.
Serbia's government is desperate to get closer to the EU. But so long as it obstructed EULEX, the EU could block Serbia's road to Brussels.
The EU also plays a key supervisory role in Kosovo through its Eulex rule-of-law mission while soldiers from EU states are deployed as part of the K-For peacekeeping mission.
In a report the Commission said Serbia had "actively and constructively" engaged in dialogue with Kosovo and had improved its co-operation with Eulex, the EU rule-of-law mission in Kosovo.
The EU plays a key supervisory role in Kosovo through its Eulex rule-of-law mission while soldiers from EU states are deployed as part of the K-For peacekeeping mission.
"If Serbia wants to achieve candidate status, it should resume the dialogue and achieve results in that dialogue, enable Eulex to work in all regions of Kosovo, and abolish parallel structures and not create new ones, " she said.
BBC: Germany's Angela Merkel ties Serbian EU hopes to Kosovo
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