Ukrainian president Volodymyr Zelensky repeated his call for peace talks as the humanitarian crisis grows. He blamed Putin for intentionally blocking aid and evacuation corridors as thousands of people remain trapped in Mariupol as fighting continues. NPR reporter Jason Beaubien joins from Lviv. Stream your PBS favorites with the PBS app: https://to.pbs.org/2Jb8twG Find more from PBS NewsHour at https://www.pbs.org/newshour Subscribe to our YouTube channel: https://bit.ly/2HfsCD6 Follow us: Facebook: http://www.pbs.org/newshour Twitter: http://www.twitter.com/newshour Instagram: http://www.instagram.com/newshour Subscribe: PBS NewsHour podcasts: https://www.pbs.org/newshour/podcasts Newsletters: https://www.pbs.org/newshour/subscribe