1) Turkey cannot support Saudi Arabia in its confrontation with Iran over the execution of a Shiite cleric, indicating tensions between Turkey and Saudi Arabia. 2) Saudi Arabia announced an anti-terror coalition targeting Iran and some Sunni Islamist groups backed by Turkey, highlighting diverging interests between the two countries. 3) The author argues that a Turkish-Iranian cooperation could push for sectarian conflict within Saudi Arabia by supporting Shiite and Sunni opposition groups respectively, exacerbating Saudi Arabia's vulnerabilities amid low oil prices and reduced social spending.