Two Russian oil refineries were attacked on Thursday as Ukraine stepped up strikes on its enemy’s energy infrastructure.

Gazprom’s Neftekhim Salavat petrochemical facility in the Bashkortostan region was set on fire after being hit by drones, local governor Radiy Khabirov said. The site is more than 800 miles from territory under Ukraine’s control, making it one of Kyiv’s deepest strikes inside Russian territory.

Ukraine’s Special Operations Forces also claimed an attack on Lukoil PJSC’s major Volgograd refinery in the Volga region. Bloomberg couldn’t independently verify the claim, and Lukoil didn’t immediately respond to an emailed request for comment.

Since last month, Ukrainian military forces have intensified drone attacks on Russian energy infrastructure, including oil refineries,

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