The war crimes trial of the former Bosnian Serb leader Radovan Karadzic is due to reach a milestone moment in The Hague on Tuesday.

His former military commander Ratko Mladic has been called to testify by Karadzic's defence lawyers.Mladic will be questioned about the genocide in Srebrenica and the killing of civilians in Sarajevo.

Al Jazeera's Paul Brennan reports from the Hague.

Source: Al Jazeera