The Russian Air Force began the war in Ukraine with a formidable inventory of combat aircraft (fixed wing and helicopters) supported by an array of stand-off munitions and EWAR capabilities. In the opening hours, it seemed that those capabilities may be paying off, with paratroopers inserting at Hostomel without interception by Ukraine's integrated air defence system (IADS). At the same time, Russian columns were (seemingly incomprehensibly) being picked apart by slow moving TB-2 Drones. But things changed quickly, and since the stabilisation of the situation, the airspace over Ukraine has been contested. Aircraft fly low to avoid interception, while new threats periodically emerge to challenge the equilibrium. In this video I look at the impact of air-defence systems on the Ukraine war, and what lessons observers may be taking based on the available data.