Russian forces have made a push into the contested Donbas region as President Vladimir Putin focuses on capturing the Eastern part of Ukraine. To understand why the area is so significant, and the long battle ahead, Judy Woodruff talks to Samuel Charap, an author and senior political scientist at The Rand Corporation, about the latest and the challenges facing forces from each country. 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