The Prime Minister of Kosovo, Ramush Haradinaj, has resigned after being charged with war crimes by the UN tribunal in The Hague.
Haradinaj was the KLA's commander in western Kosovo
Kosovo government officials said Mr Haradinaj, a former commander of the Kosovo Liberation Army (KLA), would fly to The Hague on Wednesday.
Mr Haradinaj was investigated over his role in the 1998-99 Kosovo conflict.
He led ethnic Albanian guerrillas in Kosovo's western region.
"I received an official indictment today. I am among the indicted," said Mr Haradinaj, 36.
"I am entirely innocent," he added.
The tribunal confirmed that he had been indicted, but did not disclose the charges against him.
He is also wanted by Belgrade for alleged war crimes committed against Serb civilians during the war.
Kosovo has been administered by the United Nations since the Nato bombing campaign drove out Serb forces in 1999.
In December, Mr Haradinaj was overwhelmingly endorsed by Kosovo's parliament.
He heads Kosovo's third largest party, the Alliance for the Future of Kosovo - an offshoot of the political successor to the KLA.
He has said he will co-operate fully with the International Criminal Tribunal for the former Yugoslavia (ICTY) in The Hague.
Security beefed up
International forces stepped up security in Kosovo this week.
A K-For spokesman quoted by Reuters said Germany had flown in extra troops to bolster the Nato-led K-For mission.
And the UK deployed an extra 500 troops on Monday, acting on a request from Nato, the spokesman said.
The K-For strength currently stands at nearly 20,000.
In a statement, the EU's foreign policy chief Javier Solana said: "I welcome the decision of Ramush Haradinaj to co-operate with the ICTY, following the announcement today of his indictment."