Russia launched several waves of drones targeting Kyiv early on Monday, with air defence units successfully defending the city during the attack which lasted over five hours, Ukraine's military said.

Russia and Ukraine have been ramping up the use of drones since the war began more than two years ago. Ben Solomon, a senior video correspondent for the Wall Street Journal, joins CBS News with more on the evolution of drone use in the conflict.

Note: This op-ed was written to contribute to a National Interest symposium on the challenges Russia's military will face after the Ukraine war ends. Russia’s war against Ukraine has exposed significant flaws in the design and execution of its military operations.