THE HAGUE (Reuters) - The Hague war crimes tribunal appointed a prominent Belgrade lawyer on Thursday to defend Ratko Mladic, the Bosnian Serb commander whose coming trial on genocide charges is now the UN court's biggest case. Mladic, 69, remained in isolation at Scheveningen prison on the Dutch coast before his arraignment on Friday. Serbian media reports said he would defer entering a plea, and the court would reschedule a further hearing in 30 days. "Mladic is still separated from other prisoners. He can be kept like that for up to seven days following his arrival," tribunal spokeswoman Nerma Jelacic said. The general was arrested in a Serb village last week nearly 16 years after his indictment.