From the Summary: "This report provides information on the ongoing crisis in Yemen. In 2014, the northern Yemenibased Ansar Allah/Houthi movement (referred to in this report as 'the Houthis') took over the capital, Sanaa (also commonly spelled Sana'a), and in early 2015, advanced southward from the capital to Aden on the Arabian Sea. In March 2015, after Yemeni President Abdu Rabbu Mansour Hadi, who had fled to Saudi Arabia, appealed for international intervention, Saudi Arabia and a hastily assembled international coalition (referred to in this report as 'the Saudi-led coalition') launched a military offensive aimed at restoring Hadi's rule and evicting Houthi fighters from the capital and other major cities. Since then, the conflict in Yemen has killed tens of thousands, caused significant humanitarian suffering, and has significantly damaged the country's infrastructure. One U.S.- and European-funded organization, the Armed Conflict Location & Event Data Project (ACLED), estimated in October 2019 that more than 100,000 Yemenis have been killed since 2015."
CRS Report for Congress, R43960
Congressional Research Service: https://crsreports.congress.gov/