From the Summary: "The United Arab Emirates (UAE) is a federation of seven principalities or 'emirates.' Its population is assessed at nearly 10 million, but about 90% of the population are expatriates from within and outside the region who work in its open economy. The UAE is a significant U.S. security partner that hosts about 3,500 U.S. military personnel at UAE military facilities, buys sophisticated U.S. military equipment, including missile defenses and combat aircraft, and supports U.S. policy toward Iran."
CRS Report for Congress, RS21852
Congressional Research Service: https://crsreports.congress.gov/