Prosecutor Carla del Ponte, who visited Belgrade this week, is expected to deliver her opinion to EU Enlargement Commissioner Olli Rehn in Brussels, Belgium.
Rehn has warned that talks scheduled for next week on building closer ties between the EU and Serbia and Montenegro could be suspended if Belgrade fails to show it is seriously trying to arrest Mladic and transfer him to the war crimes tribunal in The Hague.
Mladic has been indicted for genocide and other war crimes allegedly committed by his troops in the 1992-95 Bosnian war.
(AP, Reuters)