Ukraine appears to be attacking Russia's oil and gas industry with small, cheap drones that can bypass its air defenses

"Several oil and gas facilities in Russia have caught fire in recent weeks following suspected drone attacks.

Ukraine appears to be targeting energy infrastructure to hamper Russian supply lines.
Russia's air defense systems have proven to be less effective against small drones.

Ukraine appears to be targeting Russia's oil and gas industry with small, cheap drones as it seeks to disrupt Russian supply lines.
Fires have broken out at several energy infrastructure locations in Russia over the last few weeks following suspected drone strikes, including at a Rosneft oil refinery in Tuapse, a Rosneft storage facility in Klintsy, and Novatek's Baltic Sea Ust-Luga terminal." MS