Russian hackers claim to have obtained internal files detailing Ukrainian strikes on oil storage terminals in the Leningrad and Kaliningrad regions earlier this year.
The group told TASS that the stolen communications reveal the identities of those who provided exact coordinates for the facilities and individuals they accuse of pushing Ukraine toward terrorism in the areas.
The claim arrives as energy markets remain sensitive to physical supply risks in the region.
Ukrainian forces have previously targeted infrastructure in the St. Petersburg area, causing local disruptions including internet outages and flight cancellations.
Any further escalation or confirmation of damage to storage capacity could tighten regional supply chains and support higher crude prices.
Brent crude has been volatile amid ongoing geopolitical tensions, with traders closely monitoring shipping routes and infrastructure security in the Baltic.