KIEV, Nov. 2 - Ukrainian billionaire Dmytro Firtash's Group DF plans to invest up to 500 million hryvnias in the development of nitrogen producer Severodonetsk Azot in 2013, the group reported Friday.

"At minimum, we will put that amount just into the nitrogen part - we are only just composing the investment plan, and the preliminary figures are such. The amount could be more," the press service quotes Firtash as telling the company's workforce.