Back in 2022, many people assumed, including U.S. officials and other credible thinkers , that if Russian President Vladimir Putin launched a full-scale invasion of Ukraine, Kyiv would fall in a matter of days . After Ukraine proved unexpectedly resilient, there has been a rush to learn the lessons of Kyiv’s approach to war. But while outsiders have focused on technological innovation such as drones and robots, Ukrainians say that military success is still built on a human foundation.