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Displaced Yemenis sit under a makeshift shelter at a camp for internally displaced persons. Photo: STR / AFP / Getty Images

Warfare, severe food shortages and disease are devastating Yemen, already one of the world's poorest countries. The U.N. has called the situation the "largest humanitarian crisis in the world," and U.N. Ambassador Nikki Haley said recently that "no one should ever have to live the way the people of Yemen are living."

Why it matters: The U.N. estimates that more than 22 million Yemenis are in need of humanitarian assistance. The population of Yemen is 27 million.

By the numbers
How we got here
  • Yemen is nearing its third year of war between two factions: Houthi rebel forces and a Saudi-led coalition which supports President Abdrabbuh Mansour Hadi.
  • Former president Ali Abdullah Saleh, who was killed last year, relinquished his office to Hadi in 2011. Houthi rebels eventually "took advantage of the new president's weakness," after Hadi struggled with several problems in office.
  • Hadi fled the country in 2015, leading the Saudis and other Sunni Arab nations to begin "an air campaign aimed at restoring Mr. Hadi's government."

Go deeper

7 mins ago - Podcasts

Google's chief health officer Karen DeSalvo on vaccinating America

Google on Monday became the latest Big Tech company to get involved with COVID-19 vaccinations. Not just by doing things like incorporating vaccination sites into its maps, but by helping to turn some of its offices and parking lots into vaccination sites.

Axios Re:Cap goes deeper into what Google is doing, and why now, with Dr. Karen DeSalvo, Google's chief health officer who previously worked at HHS and as health commissioner for New Orleans.

Biden signs order overturning Trump's transgender military ban

Photo: Tom Brenner/Getty Images

President Biden signed an executive order on Monday overturning the Trump administration's ban on transgender Americans serving in the military.

Why it matters: The ban, which allowed the military to bar openly transgender recruits and discharge people for not living as their sex assigned at birth, affected up to 15,000 service members, according to tallies from the National Center for Transgender Equality and Transgender American Veterans Association.

GOP Sen. Rob Portman will not run for re-election, citing "partisan gridlock"

Photo: Drew Angerer/Getty Images

Sen. Rob Portman (R-Ohio) announced Monday he will not run for a third term in the U.S. Senate in 2022, citing "partisan gridlock."

Why it matters: It's a surprise retirement from a prominent Senate Republican who easily won re-election in 2016 and was expected to do so again in 2022, creating an open Senate seat in a red-leaning swing state.