Since the onset of the so-called "Arab Spring" in 2011, there has been a continuous upheaval in Yemen, which has escalated into full scale civil war between the Houthis (a Shiite political-religious movement), supported by Iran, and the internationally recognized Government of Yemen, supported by Saudi Arabia. The recent missile attack on Riyadh's International Airport, which originated in Yemen and triggered a Saudi-Lebanese confrontation, is the fourth such attack this year. The Yemeni civil war has received scant attention in Israel, but its outcome could significantly affect Israel's national security and the stability of the Middle East.