The UN Security Council, divided between Western powers on one side and Russia and China on the other, has proved helpless in halting a conflict in which activists say at least 18,000 people have been killed.
Around 100,000 died in Bosnia's 1992-95 war, as divided world powers flinched at intervening in what they saw as a complex ethnic conflict.
They only acted in the wake of the July 1995 massacre in Srebrenica, when Dutch UN peacekeepers abandoned what had been designated a UN safe haven to advancing Bosnian Serb forces, who killed 8,000 Muslim men and boys and bulldozed their corpses into pits.
The UN war crimes tribunal in The Hague said the crime, the worst massacre on European soil since World War Two, constituted genocide. Bosnia remains deeply divided, still scarred by ethnic cleansing."The United Nations is doing all that we can," Ban said of its efforts in Syria. "But action - meaningful action - will take the concerted efforts of the international community. Without unity, there will be more bloodshed. Without unity, more innocents will die."
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