Rising Drone Threat on Russian Energy Sites
First drone strike on major Russian oil export terminal.
Ukraine increased attacks on Russian energy facilities since August.
Russia launched drone and missile assault on Kyiv recently.
Russia's air defense downed 221 drones, 30 in Leningrad Oblast.
Pulkovo Airport halted flights due to drone threat.
Governor Alexander Drozdenko confirmed fire was extinguished with no casualties or environmental risks.
Attack highlights growing drone threat and escalation in conflict.