Radovan Karadzic, the former Bosnian Serb leader due to stand trial in The Hague, is to appear as a defence witness next month in an appeal for Momcilo Krajisnik, who was jailed for 27 years for crimes including ethnic cleansing.

The UN war crimes tribunal for the former Yugoslavia yesterday allowed Mr Krajisnik, the former head of the Bosnian Serb parliament, to call Mr Karadzic, who was on the run during Mr Krajisnik's original trial in 2006.