Silajdzic told the press UN documents bound the organisation to carry out sentences handed down by the Hague-based ICJ.
Deciding on Bosnia and Herzegovina's lawsuit against the former Federal Republic of Yugoslavia (Serbia and Montenegro) for aggression and genocide, the ICJ ruled in February that Belgrade was not responsible for the attack on Bosnia and Herzegovina but was responsible for not preventing the commission of genocide in Srebrenica in 1995 and for not taking measures to arrest and punish the perpetrators.
The ICJ ruled that genocide was committed and that the army and police of Republika Srpska (RS), Bosnia's Serb entity, were responsible.
The letter to Ki-Moon said the direct consequence of war crimes was a nearly ethnically clean RS in which non-Serbs were exposed to constant discrimination.
The Croat Komsic said that the UN had the moral, if not political, obligation to do something so the ICJ ruling would have sense.
Neither he nor the Bosnian Presidency's Muslim member Silajdzic said what exactly they expected of the UN, saying it was up to the organisation to decide but Komsic said it was necessary to precisely state who did what.
Komsic added he had no illusions that any measure possibly to be taken by the UN would reflect on Bosnia and Herzegovina's future constitution.
The state Presidency's Serb member, Nebojsa Radmanovic, did not support the letter, said Silajdzic.