(AP) – Warring sides in Yemen’s civil war promised visiting U.N. agency chiefs to clear obstacles to aid delivery in a nation where cholera is spreading rapidly and hundreds of thousands of children are severely malnourished, the head of the U.N. child welfare agency said Thursday. The growing suffering of Yemen’s civilians, including millions of children, is the result of fighting that erupted in September 2014 and is driven by regional rivals Saudi Arabia and Iran. The U.S. has backed a Saudi-led coalition with intelligence, satellite imagery and billions of dollars in weapons sales.