The Serbian government is preparing an amendment to the country’s budget law that will allow it to nationalize the Naftna Industrija Srbije (NIS) refinery, majority owned by Russia's Gazprom Neft and Gazprom, if no third party offers quickly emerge. Last week, NIS submitted a request to the U.S. Department of Treasury's Office of Foreign Assets Control (OFAC) to continue operations until negotiations for an ownership change conclude. "One of the amendments that will be submitted will be the one that will foresee the circumstance that at some…