Advisor to the President for Defense and Security Affairs Ali Mohsen Saleh headed on Wednesday for Saudi Arabia on an official visit. Upon his departure, Saleh said that the visit aims to convey a letter from President Abd Rabbo Mansour Hadi to Prince Muqrin bin Abdulaziz, the Second Deputy Premier, Chancellor and Special Envoy for the Saudi King. The letter deals with cooperation relations between Yemen and Saudi Arabia and ways of strengthening them.