UNITED NATIONS (AP) — Bosnian activist Munira Subasic lost 22 close family members in the 1995 Srebrenica massacre of thousands of Muslims by Bosnian Serbs, yet she was barred from speaking at a U.N. meeting where Serbia’s ultranationalist president attacked the international body’s war crimes tribunal for former Yugoslavia which has been prosecuting leaders of the genocide.

A meeting on the subject of international criminal justice and reconciliation called by current U.N. General Assembly President Vuk Jeremic — a former Serbian foreign minister — quickly became a debate Wednesday that focused primarily on the International Criminal Tribunal for the Former Yugoslavia.