How Serious Are Ukrainian Drone Attacks for Russia?

Since the beginning of the year, Ukrainian drones have attacked over fifteen Russian refineries and several oil depots in the first massive, sustained, and successful attack by Ukrainian unmanned aerial vehicles (UAVs) on Russian infrastructure, which has also involved attacks on major steel plants. Ukrainian far-reaching drone attacks started a year ago with attacks on Moscow—including the Kremlin itself. Rather than causing much real damage, their main achievement was to destroy the semblance of Russia’s invincibility, lift Ukrainian spirits, and bring the war to Muscovites, while remaining isolated events.