Why did the collapse of the Soviet Union and the power vacuum in the Balkans lead to Bosnian genocide?

After the Soviet Union's collapse, Bosnia-Herzegovina declared its independence from Yugoslavia. The lack of a strong leadership after General Tito's death and the ethnic segregation caused by newly emerged political parties almost lead the country to its destruction.

The Bosnian Serb forces killed more than 100,000 people (most of them Bosnian Muslim). One of the biggest act of genocide in European history.