Chad's President Idriss Deby urged the United Nations on Wednesday to take control of Sudan's volatile Darfur region because he said Khartoum was using the conflict there to destabilise neighbouring states. Deby, who faces threats from rebel attacks on Chad's eastern frontier with Sudan and from army desertions at home, made the call during a meeting of central African leaders which he convened in N'Djamena to discuss tensions with Khartoum.