"The U.S. has been a silent partner to the war ever since, supplying targeting intelligence, flying refueling missions for Saudi aircraft, and authorizing more than $20 billion in new weapons transfers. Since the beginning of his administration, President Barack Obama has sold $115 billion in weapons to the Saudis, more than any of his predecessors. Saudi Arabia is dependent on the U.S. in its bombing campaign, explained Bruce Riedel, a senior fellow at the Brookings Institute and 30-year CIA officer, at an event in April. “If the United States and the United Kingdom, tonight, told King Salman [of Saudi Arabia] ‘this war has to end,’ it would end tomorrow. The Royal Saudi Air Force cannot operate without American and British support.” "