Bajram Kosumi was appointed in March of last year
Kosovo's Prime Minister Bajram Kosumi has resigned after just under a year in office, official sources in the UN-administered province have said.
Mr Kosumi, a former student activist, has been accused of being ineffective. He is a key member of the delegation in talks on the future of Kosovo.
His resignation comes as a UN mediator arrives in the province for talks.
Officially still part of Serbia, Kosovo has been under UN administration since 1999 and seeks independence.
Ethnic Albanians and Serbs held two days of talks in Vienna last month, which diplomats hope may lead to a deal on Kosovo's status this year.
Kosovo Albanians, who make up the majority, want independence.
Serbia is concerned about the Serb minority.
Kosovo Serbs want wide-ranging self-government for the Serb-inhabited enclaves, which make up 5% of the population.
There are about 1.5 million ethnic Albanians in Kosovo, while about 100,000 Serbs remain following a post-war exodus of non-Albanians.