The U.S. and Germany on Tuesday moved to send advanced weapons to Ukraine to blunt a Russian offensive in the east. Steven Simon, who worked on the National Security Council staff during the Clinton and Obama administrations and a fellow at the Massachusetts Institute of Technology joins Nick Schifrin to discuss the transfer of arms and the importance of diplomacy. 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