The 9th Corps of the Yugoslav People 's Army ( `` Jugoslovenska Narodna Armija '' – JNA ) led by Colonel Ratko Mladić and the forces of the Serbian Autonomous Oblast ( region ) of Krajina ( SAO Krajina ) under Knin police chief Milan Martić besieged Besieging the Croat-inhabited village of Kijevo in late April and early May 1991 .

The secondary objective was threatening the single direct supply route between Drvar in the Bosnian Serb Republika Srpska and Knin , the capital of the Croatian Serb Republic of Serbian Krajina ( RSK ) .

The operation built Building on HV and HVO advances made Causation during Operation Summer '95 , when strategic positions allowing the rapid capture of the RSK capital Knin were gained Getting , and on the continued arming and training of the HV since the beginning of the Croatian War of Independence , when the RSK was created Creating during the Serb Log revolution and Yugoslav People 's Army ( JNA ) intervention .