Donald Trump famously promised to end the war in Ukraine within 24 hours of returning to the White House. But he is just over 100 days into his presidency, and the war is certainly not over.

With Kyiv opposed to territorial concessions, and with Russia’s military campaign showing no signs of slowing down, the Trump administration has threatened to walk away from the conflict if both sides don’t agree to a cease-fire and a path to peace—leaving Ukraine and its European partners planning for a future in which Russian aggression continues, but U.S. support does not.

In a recent article for Foreign Affairs, Jack Watling, senior research fellow for land warfare at the Royal United Services Institute in London, argues that Europe can, in fact, replace the United States as Ukraine’s primary backer.

Senior Editor Hugh Eakin spoke with Watling on April 28 about the latest developments on the battlefield—and what the coming months will demand of Ukraine and its partners in order to avoid a catastrophic defeat.

You can find sources, transcripts, and more episodes of The Foreign Affairs Interview at https://www.foreignaffairs.com/podcasts/foreign-affairs-interview.