A plywood aircraft with no warhead and a metal-coated sphere in the fuselage. The Luneburg lens makes it read on radar as a Shahed, so Ukrainian air defence must treat every one as lethal — which is the entire weapon.
Ukraine's "buzz bomb" — a deliberately crude, dirt-cheap pulsejet missile built by volunteers to be fired in salvos and mixed with decoys, forcing Russia to spend million-dollar interceptors on a $3,000 target. The loudness is the point.
Low-cost multi-purpose Russian drone, a Shahed-136 lookalike used as a saturation decoy, one-way attack, reconnaissance and signal relay, forcing costly air-defense engagements at extreme cost asymmetry.