Petróleo Brasileiro SA (Petrobras), Rio de Janeiro, has terminated negotiations with Russia’s Acron Group without a deal being concluded for the sale of its 100 percent stakes in the nitrogen fertilizer plant Araucária Nitrogenados SA (ANSA), in Paraná state, and the still-to-be completed Unidade de Fertilizantes Nitrogenados III (UFN-III) nitrogen fertilizer plant at Três Lagoas in Mato Grosso do Sul state, according to a Bloomberg report, citing a Petrobras filing.