A defence pact among Saudi Arabia, Turkey and Pakistan appears to be aimed at deterring Iran and Israel from tearing up the Middle East with their conflict amid Washington’s inability to guarantee regional security, observers say. Under the terms of the deal signed on Friday in Mecca by Saudi Crown Prince Mohammed bin Salman, Turkish President Recep Tayyip Erdogan and Pakistani Prime Minister Shehbaz Sharif, an armed attack against any one of the three states “shall be regarded as an attack...