With their dense mesh, the nets can tangle drone propellers. It’s a simple but effective countermeasure that reflects how low-tech means can blunt high-tech weapons in the war.

DAVID SHIMER served on the National Security Council from 2021 to 2025, including as Director for Eastern Europe and Ukraine and Director for Russian Affairs, and is an Adjunct Senior Research Scholar at Columbia University’s School of International and Public Affairs.

At least three children were among 27 people wounded as a result of a Russian drone attack on Ukraine's second-largest city of Kharkiv overnight that damaged apartments and a kindergarten, Ukrainian authorities said on Monday.