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(Bloomberg) — Ukraine carried out record attacks on strategic oil infrastructure in Russia last month as the US attempts to broker a peace deal to end the near four-year war.

Ukraine’s military used drones to attack Russian refineries at least 14 times in November, according to data compiled by Bloomberg from public statements by both nations.

That all-time high coincides with four attacks on Black Sea oil-loading facilities last month, as well as on explosions on tankers moving Moscow’s oil.

Russia and Ukraine are fighting an increasingly intense energy war as they attempt to gain a meaningful advantage after months of stalemate on the frontlines and ahead of potential new peace talks.

Ukraine targeted two tank

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