Ukraine is using Clearview AI’s facial recognition software to uncover Russian assailants and identify Ukrainians who’ve sadly lost their lives in the conflict.

The company’s chief executive, Hoan Ton-That, told Reuters that Ukraine’s defence ministry began using the software on Saturday.

Clearview AI’s facial recognition system is controversial but indisputably powerful—using billions of images scraped from the web to identify just about anyone. Ton-That...