Russia’s Leningrad Oblast lies some 600 kilometers from the closest corner of Ukraine. But on April 15, its governor declared it a “frontline” region. Part of his explanation: From January through March, a total of 243 Ukrainian drones were shot down over the province, he said. Some drones were not shot down, though. From export terminals on the Gulf of Finland to refineries inland, oil facilities in the region that surrounds St. Petersburg, President Vladimir Putin’s hometown, have been among the hardest hit in an upsurge…

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