BANJA LUKA (Bosnia and Herzegovina), March 13 (SeeNews) – Russian state-controlled oil company Zarubezhneft will invest 30 million euro ($41.7 million) in Bosnian oil refinery Rafinerija Nafte Brod [BANJ:RNAF-R-A], in which it holds a majority stake, aiming to improve the working conditions, the president of Bosnia’s Serb Republic, Milorad Dodik, said.