The U.S. this week authorized one of its largest arms packages yet for Ukraine with $800 million worth of weapons designed to help it against an expected battle in the east. The question of whether to arm Ukraine is one that has challenged American policymakers for years. Ali Rogin looks back at how recent presidents have addressed that question and what the Biden administration has learned. 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