Inside Ukraine’s secretive tech world building the future of war

Serhii Kupriienko sits in an unadorned room in an unadorned house on a quiet residential street in Kyiv, sketching out for me what the future of war looks like. “I’m not very good at drawing,” he says, dragging a blue marker across the lid of his laptop (he assures me it washes off), creating a series of rough formations meant to represent groups of drones. The point of the art is to show how his company is making it so the machines might better coordinate with one another in order to elimina...