Other defendants at the court include Croatian Serb rebel leader Goran Hadzic , accused of crimes against humanity and war crimes ; and Vojislav Seselj , a Serb nationalist politician who faces charges of crimes against humanity and war crimes . 1992 : Ratko Mladic declines to answer questions on Srebrenica massacre , Sarajevo siege . Mladic says U.N.-backed court is ` ` " , '' argues it could harm his own case . He is called as a defense witness in the trial of ex - Bosnian Serb leader Milan Karadzic . Both men are being tried on charges of genocide and other war crimes during the 1990s .
1992 : Ratko Mladic declines to answer questions on Srebrenica massacre , Sarajevo siege . Mladic says U.N.-backed court is ` ` " , '' argues it could harm his own case . He is called as a defense witness in the trial of ex - Bosnian Serb leader Milan Karadzic . Both men are being tried on charges of genocide and other war crimes during the 1990s .