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SAINT PETERSBURG: Ukra­inian drones struck energy and military facilities in Saint Petersburg on Wednesday, casting a pall of black smoke over the city as international officials gathered for Russia’s flagship annual economic forum.

Ukrainian President Volodymyr Zelensky called the attacks “fair” retaliation for Russia’s ongoing bombardment and warned of further strikes.

The assault targeted the Saint Petersburg oil terminal and the Kronstadt naval base, where the commander of Ukraine’s drone forces said a Russian warship was hit.

The strikes injured several people and damaged infrastructure, Saint Petersburg Governor Alexander Beglov said, noting there were no fatalities. The Kremlin vowed to respond systemically to the attack, which occurred a day after Russian missiles and drones killed 23 people across Ukraine.