What does Ukraine's million-drone army mean for the future of war?

Ukraine's president Volodymyr Zelensky has promised that in 2024 the country's military will have a million drones. His nation already deploys hundreds of thousands of small drones, but this is a step change – a transition to an armed forces with more drones than soldiers. What does that mean for the future of war? This technology has already transformed the conflict between Russia and Ukraine.