Ukrainian strikes targeted Russia's Rosneft refinery in Ryazan and a Lukoil facility in Perm, President Volodymyr Zelenskyy said in a Telegram post on Wednesday, as the country resumed attacks on Moscow's downstream sector after a two-week lull.
A fire was reported at the 340,000-barrel-per-day Ryazan refinery, the Ukrainian Armed Forces said in a separate social media post.
Satellite imagery by National Aeronautics and Space Administration, as cited by Bloomberg, showed heat anomalies on the edge of the Ryazan facility on July 29, potentially indicating a fire.
Similar heat anomalies were also observed on the 260,000-barrel-per-day Perm refinery, according to the report.
Ukraine had also targeted the Ryazan refinery in mid-May, reportedly resulting in a shutdown through the beginning of July.
Rosneft and Lukoil did not immediately respond to' requests for comments.