Interros, the private equity fund of Russian tycoon Vladimir Potanin, will face off against the other major shareholder in Russian mining outfit Norilsk Nickel in a tussle over the make-up of the board, the firm announced. Potanin, who holds abour 25 percent of Norilsk through Interros, will support the board while the other major shareholder, Oleg Deripaska, is seeking to dismiss the board and bring in new executives.