In what the U.N. refugee agency calls the fastest-growing refugee crisis in Europe since World War II, more than a million Ukrainians have fled their country since Russia invaded less than two weeks ago. The bulk of them have traveled through Poland and many are staying there. That's where Ari Shapiro spoke with acting United States ambassador to Ukraine Kristina Kvien. She and her staff relocated to Poland soon after the fighting started, and she discusses the strain this new humanitarian crisis is putting on the bordering countries. In participating regions, you'll also hear a local news segment to help you make sense of what's going on in your community.Email us at considerthis@npr.org.