Oligarch spat undermining Rusal

The Russian aluminium producer's net profit for 2011 fell by more than 90 per cent after a $1.4bn writedown on the value of its 30 per cent stake in Norilsk Nickel . Lex's Nikki Tait and Richard Stovin-Bradford discuss the implications for the investors of the determined pursuit of Norilsk by Rusal's controlling shareholder Oleg Deripaska .