In September 2014, the Houthis, a revolutionary Islamist movement, seized control of the Yemeni capital of Sanaa, precipitating a civil war in the country that continues to this day. Who are the main actors in the Yemen conflict? What is the role of the United States? What do the Houthis really want? Professor Bernard Haykel of Princeton University, a noted expert on Yemen, addresses these questions and more, including potential avenues for resolving the unending conflict.