• Ukraine's military uses drones to hit oil refineries and depots in Russia.
• Drones can travel 800-1,200 miles and have hit targets in Moscow and Siberia.
• Ukraine's drone strikes have helped gain momentum in the war.
• The strikes are part of Ukraine's strategy to defend itself and end the war.

Ukraine's use of drones may indicate a shift in the balance of power in the conflict, as the country seeks to weaken Russia's war machine. The strikes could suggest a new era of asymmetric warfare, where smaller nations use advanced technologies to counter larger adversaries, which may have significant implications for the future of military strategy.