Why has Russia been unable to suppress Ukrainian air defenses? What is the true state of its missile stockpiles and production rates? Is the F-16 the best aircraft to provide to Ukraine to replace its old Soviet fighter jets? How can the West disrupt the chips supplies for the Russian military? Dmitri Alperovitch talks to Justin Brock and Dr. Jack Watling from Royal United Services Institute (RUSI) about their findings from the recent trip to Ukraine