First Lady Jill Biden spent part of this Mother's Day making an unannounced visit to Ukraine, meeting with her Ukrainian counterpart, Olena Zelenska, as America’s top diplomat returned to the post in Kyiv for the first time since the war began. Meanwhile, Russian attacks continued overnight, including a strike on a school in eastern Ukraine that officials fear killed dozens. Nick Schifrin reports from Kharkiv. 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