Since March, Ukraine has systematically dismantled Russia’s refining system, driving crude processing to its lowest level in 21 years and forcing Moscow to ban exports of gasoline, jet fuel and diesel. Russian refineries processed an average of 3.91 million barrels of crude per day in early July, according to Energy Aspects data cited by Bloomberg. That was more than 1.4 million barrels per day below the previous year’s average and the lowest national processing rate since March 2005. Ukraine has hit at least 24 of Russia’s 34…