Deputy Crown Prince Muhammad Bin Salman, second deputy premier and minister of defense, met with US Secretary of Defense Ashton Carter in Riyadh on Tuesday, the Saudi Press Agency reported. During the meeting, they discussed the existing military cooperation between the two countries and ways to further enhancing them. They also discussed the latest developments in the Middle East, including the Iranian interference in the regional affairs, and combating terrorism. The meeting was attended by several senior officials from both sides.