Former Bosnian Serb army chief Ratko Mladic has been ordered to appear for the defence in his former political master Radovan Karadzic's war crimes trial.
The United Nations' Yugoslav war crimes granted Karadzic's request for a subpoena and ordered it served on Mladic in the court's detention unit.
Themove sets up a tense courtroom reunion of two men accused of being the chief architects of Bosnian Serb atrocities in Bosnia's 1992-95 war that left 100,000 people dead.
Karadzic requested a subpoena in April, saying Mladic - who also is on trial at the tribunal - refused to appear voluntarily.
Mladic is expected to be called as a witness in January.
Both men insist they are innocent of charges including genocide and crimes against humanity.