Serbian authorities have reassured citizens that the country has sufficient fuel reserves to supply the domestic market, with the fate of the country's only refinery, Naftna Industrija Srbije (NIS), hanging in the balance. "The economy and citizens have no reason for concern, as there are sufficient quantities of all petroleum derivatives," the government statement said, with Energy Minister Dubravka Djedovic Handanovic saying the government is ready to use mandatory reserves if need be. Russia's Gazprom Neft and Gazprom affiliates are the majority…