Turkish President Recep Tayyip Erdogan is scheduled to arrive in Riyadh tomorrow on an official visit to the Kingdom during which he will hold talks with the Custodian of the Two Holy Mosques King Salman bin Abdulaziz Al Saud. During the meeting with the monarch, bilateral relations between the two countries and ways of enhancing them in various fields will be discussed as well as regional and international issues of mutual concern.