In August 2022, I became a rifleman in an infantry battalion of the Ukrainian Armed Forces (Zbroyny Sily Ukrainy, ZSU). Over the course of the following year, I would spend a total of ten months fighting with the unit on the front lines in the Kharkiv, Donetsk, and Luhansk Oblasts. Before joining the ZSU, I had been a Ph.D. student in political science and before that an officer in the Armed Forces of the Slovak Republic. My time in the trenches gave me certain insights into the war that, I hope, might be useful to readers who want to gain a better understanding of the most important armed conflict of our lifetimes. They might also be interesting to those who want to help NATO militaries better prepare for future conflicts.

The Ukrainian flag flutters between buildings destroyed in bombardment, in the Ukrainian town of Borodianka, in the Kyiv region, on April 17, 2022. Sergei Supinsky/AFP via Getty Images
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