Serry told the press in Sarajevo on Tuesday the NATO headquarters due to start operating in Bosnia on December 2 would have clearly defined tasks supporting the defence reform, the apprehension of war crime indictees, and the struggle against terror.
The 150 officers from NATO member-countries who will comprise the headquarters in Sarajevo will help Bosnia join the Partnership for Peace programme as soon as possible, among other things.
Serry added this would not take place before the conditions he said were familiar were met.
Earlier this year NATO made Bosnia's admission to the programme conditional on the arrest of the Hague war crimes tribunal's most wanted indictees -- Radovan Karadzic and Ratko Mladic.
Serry said the international community would continue tracking them down, but underlined that the primary responsibility for their arrest lay with Bosnia's state and Serb entity authorities.
The High Representative to Bosnia, Paddy Ashdown, said in a statement delivered to the media in Sarajevo that there existed clear evidence that Bosnian Serb entity authorities had done nothing to arrest Karadzic and Mladic but had harboured them, like the authorities in Belgrade, for years.
Dnevni Avaz daily provided the latest piece of evidence by publishing a copy of Mladic's military card, which shows that he was listed as a member of the Yugoslav Army until the autumn of 2001, while the Bosnian Serb entity army kept him among its active officers until the summer of 2002.
Ashdown said this piece of evidence was scandalous and that it pointed to a flagrant violation of commitments under the Dayton peace agreement and to the Hague war crimes tribunal.
Ashdown said this was a key piece of evidence pointing to the existence of systematic institutional weaknesses in the Bosnian Serb entity police and military.