Former Nato commander Wesley Clark has ended his first day of testimony in the war crimes trial of Slobodan Milosevic.
Clark was expected to clash with Milosevic in court
Mr Clark, who directed the 1999 air campaign against Serbia, is one of the best known figures to testify at the trial of the former Yugoslav president.
The two-day hearing began on Monday behind closed doors in The Hague.
In an unprecedented agreement between the court and the US, Washington will be allowed to review Mr Clark's testimony before it is made public.
The US will have two days to apply for parts of the testimony to be removed from the public record if it considers them harmful to US national interests.
An edited recording is due to be made public on Friday.
Mr Clark, speaking to reporters after his first day of evidence, accused Mr Milosevic of responsibility for years of death and destruction in the Balkans.
The meeting between Mr Clark and Mr Milosevic is sure to become a political showcase, says the BBC's Geraldine Coughlan, reporting from The Hague.
Milosevic was expected to accuse Nato of war crimes
Both men are candidates bidding for power in elections at home.
Wesley Clark is fighting for the Democratic nomination in the 2004 US presidential election, while Mr Milosevic is a candidate for the Socialist Party in Serbia's parliamentary elections on 28 December.
Mr Clark said before testifying that he expected to give information on more than 100 hours of meetings over four years with Mr Milosevic during the 1990s.
Prosecutors say this will help to establish what Mr Milosevic knew about war crimes and when he knew it.
The former Yugoslav president has often accused Nato of aggression in court and he will certainly grab the chance to point the finger at the alliance for the war crimes he alleges they committed during the bombing campaign against Serbia.