Ukraine continues to cripple Russia's energy sector by hitting numerous oil refineries, depots, chemical plants, and more with drones.

A drone attack overnight on Jan. 14 caused damage to an industrial facility in the city of Engels, located in Russia's Saratov region. Engels lies around 600 kilometers (370 miles) from the front lines in Ukraine.

Ukraine launched waves of long-range strikes, including its ATACMS and Storm Shadow missiles, at targets inside Russia.

Ukrainian drones attacked the Russian cities of Saratov and Engels during the night, damaging an industrial facility, according to Roman Busargin, the governor of the Saratov region.

Kyiv targeted Russian factories developing weapons, an oil depot, a refinery and air defense systems, a Ukrainian official said.

While the ground war in eastern Ukraine has settled into a grinding war of attrition, where Russian forces sacrifice hundreds, sometimes thousands, of troops a day, for small, incremental advances, the air war has the two sides inflicting significant losses on each other's energy sector.

Located in Saratov Oblast, over 750 kilometers from the Ukrainian border, Engels airbase is home to Russian heavy bombers.

Roman Busargin, Saratov regional governor ... while Ukraine will likely plug away with further efforts to damage Russia's oil facilities deep into Russian territory.

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Ukrainian intelligence drones targeted an oil depot in Russia’s Tula region, 500 km from the border, causing a large fire despite Russian claims of successful air defense.