Saudi army tanks are seen deployed near the Saudi-Yemeni border, in southwestern Saudi Arabia, on April 9, 2015. The Saudi-led coalition launched its air war against the Huthis on March 26, 2015, as the rebels closed on Yemeni President Abedrabbo Mansour Hadi's last refuge in Aden, prompting him to flee to neighbouring Saudi Arabia. AFP PHOTO / FAYEZ NURELDINE (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)
