In an office block with no door numbers or names, Serhii Krupiienko slams his green, “military-grade” laptop on to the floor to prove its resilience. He hands it to me: “Have a go!” he urges with a grin. “It’s really fun. Throw it!”
This 39-year-old father of three has reason to be cheerful. He believes his start-up military technology (mil-tech) company is on the verge of a breakthrough that could give Ukraine an edge in its David and Goliath-like war with Russia.
