Russia's largest oil companies, including Rosneft, Gazprom and Lukoil, temporarily stopped selling gasoline in the St. Petersburg's International Commodity Exchange. 

      Russian companies started leaving the exchange in May, Rosneft and Gazprom were the first ones to quit, in late May Lukoil also left the exchange, in June Bashneft and Russneft also stopped trading. 

The Vedomosti newspaper attributes this exchange run away to an oil crisis, which took place in May, 2011. According to the resource, all the companies promised to go back to the exchange in the nearest future.