Ukraine fired a volley of British Storm Shadow cruise missiles into Russia on Wednesday, the latest new Western weapon it has been permitted to use on Russian targets a day after it fired U.S. ATACMS missiles.

Ukraine appears to be calling on a fleet of fire-spewing “dragon drones” in its war with Russian invaders, putting a modern twist on a munition used to horrific effect in both world wars.

A battery fire or hydrogen tank explosion is the worst nightmare of any owner of an electrified vehicle. But this grim potential was recently put to good use by Ukrainian fighters against Russian invaders, against whom they deployed a remote-operated bomb that was partially built using a Toyota Mirai hydrogen car’s fuel tank. In a sense, they might...