The killing of Nasser al-Wuhayshi is described as the most significant setback to Al Qaeda since the death of Osama Bin Laden in 2011. But counterterrorism officials warn that the group's threat remains potent.
Houthi militias allied with the country's former dictator hold sway over large swathes of Yemen, and have stood firm against a Saudi-led bombing campaign launched in March. Several US citizens are reportedly being held by Houthis.
Houthi rebels have agreed to a five-day truce proposed by Saudi Arabia to allow aid into the country. The UN estimates that at least 300,000 Yemenis have been displaced by the fighting.
Saudi officials had signaled that negotiations may be at hand in Yemen. But with Houthi advances continuing and a resumption of airstrikes, prospects of a political resolution have receded.