It’s been more than two decades since the war in Bosnia ended. It remains one of the darkest chapters in modern European history and cost over 100,000 lives. Since the Dayton Agreement was reached in 1995 a fragile peace has held, but last month the international community's chief representative there - Christian Schmidt - warned that conflict might return and the country is in danger of breaking up. Bosnia-Herzegovina's senior ethnic Serb politician, Milorad Dodik, has threatened to pull the territory he governs inside Bosnia out of state-level institutions including the army. The issue that drove so much of the war - Serb nationalism - now appears to be on the rise across the Western Balkans. Serbia has deployed armoured vehicles and aeroplanes along its border with Kosovo and is accused of stoking religious tensions in neighbouring Montenegro. So how dangerous is this moment in Balkans history? Are the EU and the US doing enough to diffuse tensions? And how much of the blame can be laid at the feet of Serbia’s ally Russia? Ritula Shah is joined by a panel of experts. Producers: Junaid Ahmed and Paul Schuster.