Yemeni officials say the government has been forced to delay its return to the city of Aden, blaming southern separatists for stalling on the key point of a power-sharing deal signed early this month to end their infighting. Under the agreement brokered by Saudi Arabia between Yemeni President Abed Rabbo Mansour Hadi and the separatists, backed by the United Arab Emirates, the government was to have returned to Aden last Tuesday.