Yaroslav Oleynik, a key figure in Ukraine’s military drone program, was killed in a car crash over the weekend. Oleynik, who was just 28 years old, played a crucial role in boosting Ukraine’s drone manufacturing to fight against Russia.

The accident happened just days after Oleynik’s boss, Aleksandr Kamyshin, left his position as Ukraine’s Strategic Industries Minister due to a major government shake-up. Oleynik was driving with his wife, Nina, when their car was involved in a fatal coll...