Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Turkish Military Sees Opportunity in Vulnerable and War-Torn Places Namo Abdulla WASHINGTON - A Turkish government decision earlier this month to turn back Istanbul's historic Hagia Sophia into a mosque after more than 80 years as a museum has renewed debate over the direction of the Muslim country, with some experts saying President Recep Tayyip Erdogan, through his expansionist policies at home and abroad, is attempting to revive a new Ottoman Empire. Built in 567, the third and current Hagia Sophia was a major Christian church until a 15th-century sultan converted it into a mosque. In 1935, the secular founder of modern Turkey, Mustafa Kemal Ataturk, turned the Byzantine edifice into a museum for all to visit. Despite global condemnation, Hagia Sophia held its first prayer service Friday. Wearing a religious head covering, Erdogan participated in the service by reciting verses from the Quran. He later called converting the site into a mosque his great achievement and "the rebirth of our nation." "Erdogan sees himself as the caliph of the Muslim world," David Phillips, director of the Peace-Building and Rights Program at Columbia University, told VOA. Outside Turkey, the Islamist-leaning leader is pursuing an expansionist policy, Phillips said. .