In this Thursday, March 26, 2015 file photo, provided by the Saudi Press Agency (SPA), Yemen’s President Abed Rabbo Mansour Hadi, left, walks with Saudi Defense Minister Mohammed bin Salman as Hadi arrives in Riyadh, Saudi Arabia. The United States is speeding up the delivery of weapons to the Saudi-led coalition launching airstrikes against Shiite rebels in Yemen and is committed to defending Saudi Arabia, U.S. Deputy Secretary of State Antony Blinken, said Tuesday, April 7, 2015, in the Saudi capital, Riyadh. (AP Photo/SPA, File)