As Russia’s invasion of Ukraine grinds into its fourth month, officials in Kyiv have expressed fears that the specter of “war fatigue” could erode the West’s resolve to help the country push back Moscow’s aggression.

The U.S. and its allies have given billions of dollars in weaponry to Ukraine. Europe has taken in millions of people displaced by the war. And there has been unprecedented unity in post-World War II Europe in imposing sanctions on President Vladimir Putin and his country.