Pakistan, Turkey and Saudi Arabia have signed a mutual defense agreement, while the Iran-backed Houthi rebels have stepped up attacks on Saudi-linked targets. Pakistan, Turkey and Saudi Arabia sign a mutual defense agreementOil-rich Saudi Arabia, nuclear power Pakistan and Turkey, which has NATO’s second-largest army and a rapidly growing defense industry, signed a mutual defense agreement on Friday. It was signed during a meeting in Saudi Arabia between Saudi Crown Prince Mohammed bin Salman, Turkish President Recep Tayyip Erdogan and Pakistan’s Prime Minister Shehbaz Sharif, Pakistan's foreign ministry said. The deal comes at a time when Saudi Arabia, whose critical infrastructure and oil facilities have come under attack as part of the war in Iran, has been looking to diversify its defense partnerships. The Houthis did not immediately claim the attack on Najran in Saudi Arabia.