In the span of two weeks, Russia has launched two major drone attacks on Ukraine. Scores of so-called “kamikaze drones,” purchased from Iran, have been attacking Ukrainian civilians and devastating power and water infrastructure.Dr. Stacie Pettyjohn is a senior fellow and director of the defence program at the Center for a New American Security. She’s back on the show to tell us how these drones work and what air defence systems from allies might do to help Ukraine.Questions? Comments? Ideas? Email us at thedecibel@globeandmail.com