Ukraine claimed Saturday to have struck one of Russia’s largest oil refineries in a drone attack, starting a fire at the facility more than 700 miles into Russian territory.

Russia accused Ukraine of conducting a deadly missile strike Friday on a supermarket in the Moscow-controlled city of Donetsk, while Kyiv reported a massive wave of Russian drone attacks on several regions and fierce fighting near the strategic logistics hub of Pokrovsk in eastern Ukraine.

Since Russia’s invasion of Ukraine in 2022, the U.S. has carefully calibrated its sanctions of the Russian energy sector, fearing a sharp rise in global oil prices and the cost

The U.S. Treasury on Friday announced sweeping new sanctions against the Russian energy sector, including oil majors Gazprom Neft and Surgutneftegaz, to try to hinder Moscow in its war with Ukraine. Britain also joined the sanctions against those two companies,