Samantha Power has long championed humanitarian intervention. Ethiopia’s crisis is putting her to the test.

Power’s past advocacy for humanitarian intervention, including with U.S. military force, has fallen out of favor in recent years as public confidence in Washington’s ability to reshape distant lands wanes. U.S. forces will conclude a 20-year occupation in Afghanistan in September, and the military will formally end combat operations in Iraq by the end of the year, Biden said last week. The two missions have cost thousands of lives, trillions of dollars and fallen far short of U.S. ambitions to bring about stability, democracy or prosperity. The protracted chaos and bloodshed in Libya following the ouster of Moammar Gaddafi in a NATO-led military operation in 2011 also dampened the appeal of humanitarian interventions.