By David Brunnstrom BRUSSELS, July 23 (Reuters) - The EU said on Wednesday unfreezing trade benefits for Serbia would have to wait until a U.N. prosecutor decides if it is cooperating fully in catching war crimes suspects, despite Radovan Karadzic's arrest. On Tuesday European Union Enlargement Commissioner Olli Rehn called on the bloc to allow Serbia improved trading conditions following Monday's arrest of the wartime Bosnian Serb leader. EU foreign ministers called the arrest a milestone on Serbia's road to joining the EU, but several stressed Karadzic's wartime military commander, Ratko Mladic, also wanted for genocide, was still at large and said Belgrade must go further to reap full benefits. Officials from the 27 EU states agreed on Wednesday to wait before deciding on whether to unfreeze trade benefits until a report...
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