On October 6, the U.S. State Department approved a potential $15 billion Foreign Military Sale to Saudi Arabia for Terminal High Altitude Area Defense (THAAD) and related support, equipment, and services. The deal comprises 44 THAAD launchers, 360 missile interceptors, seven AN/TPY-2 radar systems, and other related parts, training, and equipment. A day before the THAAD sale was announced, al-Arabiya television reported the Kingdom would be purchasing Russia’s S-400 air defense system.