Waleed Alhariri, U.S. director of the Sana'a Center for Strategic Studies, discusses major developments in the Yemen conflict, which remains the world's worst humanitarian crisis. With renewed momentum at the UN and in U.S. Congress, an increased international focus on the war after the Jamal Khashoggi murder, and a fragile ceasefire in Hudaydah, Yemen's biggest port, Alhariri is "carefully optimistic" that conditions could improve in the coming months.