A Russian oil refinery in Syzran, Samara Oblast, was struck in a Ukrainian attack overnight on May 21, social media channels reported.
Local residents reported that an oil refining unit at Rosneft's Syzran Oil Refinery was struck in the Ukrainian attack, according to independent Telegram news channel Exilenova Plus.
Two people were killed in the Ukrainian drone attack, Samara Oblast Governor Vyacheslav Fedorishchev later said.
The reports could not be immediately verified by the Kyiv Independent.
Syzran, Samara Oblast's third largest city, is located about 700 kilometers (440 miles) northeast of Ukraine's border with Russia.
Ukraine regularly strikes military infrastructure deep within Russia and the occupied territories in an effort to diminish Moscow's capacity to continue waging its war.
All of central Russia's major oil refineries have completely halted or rolled back production following recent Ukrainian drone strikes, Reuters reported May 20.
On May 18-19, Ukraine struck one of Russia's largest oil refineries and an oil pumping station, Ukraine's General Staff said, after Russian officials reported drone attacks in Yaroslavl Oblast and near Moscow.
Ukrainian forces targeted the Lukoil-Nizhegorodnefteorgsintez oil refinery in Kstovo, Nizhny Novgorod Oblast, the General Staff said, where a fire was recorded on the facility's territory on May 18.
On May 20, Ukraine struck one of Russia's largest oil refineries near the town of Kstovo, Nizhny Novgorod Oblast, Ukraine's General Staff said — marking the second reported hit on the site within a week.
An AVT-6 oil refining unit was hit, leading to a subsequent fire at the Lukoil-Nizhegorodorgsintez refinery, according to the General Staff.
