Russia has signed a deal with Saudi Arabia for the delivery of anti-aircraft missiles after initial confusion over whether the deal took place or not. The sale of the S-400 surface-to-air missile systems follows King Salman’s visit to Moscow last Thursday. A preliminary agreement was also reportedly reached to buy anti-tank guided missile systems, multiple rocket launchers, as well as to organize production of the Kalashnikov automatic rifle in Saudi Arabia. The following day, the U.S. Defense Security Cooperation Agency announced $15 billion in weapons sales to Riyadh...