Micunovic, a former president of the Democratic Party, testified about efforts by the Serbian opposition to prevent the break-up of the former Yugoslavia and the war in Bosnia-Herzegovina and the resistance of Serbian opposition parties to the regime of Slobodan Milosevic.
Micunovic was the seventh witness who spoke before the Hague-based court in defence of the authorities in Belgrade against genocide charges. Bosnia-Herzegovina previously called two witnesses.
The ICJ has imposed an embargo on media reporting about the content of testimonies, which expires today, the day of the last testimony.
The proceedings started in March 1993 with Bosnia-Herzegovina filing a lawsuit against the then Federal Republic of Yugoslavia (FRY). The genocide suit was filed in the midst of the war in Bosnia-Herzegovina in an effort to avert the aggressor from further crimes.
The two sides presented their arguments in writing in the first two stages, with Serbia and Montenegro repeatedly contesting the jurisdiction of the ICJ, which in 1996 declared jurisdiction over the case.
In the last, third stage of the trial, from 18 April to 9 May, representatives of the two countries will present closing arguments on the issue of Belgrade's responsibility for the genocide committed by Bosnian Serb forces against Bosnian Muslims from 1992 to 1995, which has been established by two final verdicts at the International Criminal Tribunal for the former Yugoslavia (ICTY).
The ICJ will be deliberating the case for several months before it reaches a verdict in its first case dealing with violations of the 1948 UN Convention on Genocide.
The verdict will be pronounced in public without the possibility of appeal.