Moscow: At least 12 people were killed and 39 injured in a Ukrainian drone attack on industrial and civilian targets in the city of Nizhnekamsk in ‌Russia's Tatarstan region - ⁠the ⁠site of a major oil refinery - Radmir Belyayev, the city's mayor, said on Monday.The region's oil refinery, ​one of Russia's most technologically advanced, was hit in the attack, according to various ​Russianmedia. In unverified videos on ⁠social media, ‌smoke can be seen rising over ​what ​appears to be an oil ⁠refinery. Reuters wasunable to independently verify the ​footage.Read more: Ukraine's Zelenskiy says up to 50,000 North Korean troops to be deployed in RussiaTatneft's TANECO refinery, which was ​hit by Ukraine in early June, processed 17 million tons of crude oil in 2024, producing2.7 million tons of gasoline and 8.5 million tons of diesel fuel.