O n a frigid day late last month, a Russian attack drone slipped through Ukraine’s air-defense systems and glided into Kyiv’s government district, heading in the direction of President Volodymyr Zelensky’s office. The drone flew so low that officials inside the Cabinet of Ministers building could see it passing beneath them from their windows on the seventh floor. “A bunch of people saw it and were running around, like, ‘What the fuck was that?’” one government official recalled. The drone,