Ukrainian forces struck oil infrastructure sites near Saint Petersburg on Friday evening, according to President Volodymyr Zelenskyy.
The announcement confirms reports of attacks on fuel facilities in the Russian northwest, marking a significant escalation in targeting energy assets deep inside Russian territory.
Brent crude prices climbed in the session as traders assessed the potential impact on Russian export logistics.
The strikes on storage and processing infrastructure near a major port city raise concerns about short-term supply bottlenecks, even as global markets remain focused on broader OPEC+ production levels.
The attack comes just days after Moscow launched a massive drone and missile barrage on Kyiv, which killed at least 30 people and damaged more than 20 sites across the Ukrainian capital.
The reciprocal escalation underscores the growing vulnerability of Russian energy infrastructure to long-range Ukrainian strikes.