Izetbegović, who had hoped to prevent Bosnia and Herzegovina from falling under the influence of Croatia or Serbia, signed the agreement after Stjepan Kljuić, president of the Croatian Democratic Union's (HDZ) branch in Bosnia and Herzegovina, was replaced by Tuđman with Mate Boban, who blocked the delivery of supplies to Sarajevo where a siege was under way and had proclaimed an independent Croatian Republic of Herzeg-Bosnia (HR-HB). The agreement fell apart in October after a number of events including the assassination of Blaž Kraljević, leader of Croatian Defence Forces (HOS) in Bosnia and Herzegovina, the fall of the areas of Posavina, Bosanski Brod, and Jajce into the hands of the Army of Republika Srpska (VRS), and after a major battle broke out between the HVO and the ARBiH in Prozor.