A cheap drone is giving Ukraine’s military an edge against Russia

Ukraine’s fierce resistance against Russia’s invasion has surprised many observers, but that’s in part because one weapon in their fight—a low-cost, missile-toting flying robot—is fulfilling predictions made by military futurists.

Russia has seen shocking losses of tanks and other armored vehicles. While the true extent is hard to know, attempts by open-source intelligence analysts to document losses verified by photographic evidence suggest hundreds of vehicles have been lost. Some 33 of those vehicles—including two trains carrying fuel to Russian forces—have been destroyed by a cheap Turkish drone called the Bayraktar TB2. And that’s a...