In a post on Telegram, Vorobyov writes that seven more people have been injured in the region.
According to the Kyiv Independent, Ukraine has attacked an oil facility in Stavropol in southern Russia.
The region's governor writes on Telegram that the attack caused a fire in an "industrial area", but that no deaths have been reported there.
Ukraine has recently targeted Russian energy facilities, leading to fuel rationing or fuel shortages in more than 90 percent of Russian regions since June, according to local media and official statements.
