By John Helmer in MoscowUralkali’s former majority owner Dmitry Rybolovlev has divested a 53.2% stake in the company through a three-cornered sale, in a move that could lead towards the formation of a Russian potash monopoly, a source from one of the buyers informed IM.According to the source, the deal paves the way for Uralkali to be linked with Silvinit, which would combine country’s two largest potash producers.Uralkali is also the power behind the Belarusian Potash Company (BPC), the swing seller and market maker in the global potash trade. Both have been controlled until now by Rybolovlev.At peak in June 2008, London-listed Uralkali was valued in the stock markets at $34.3bn. But after grain and fertiliser prices collapsed that autumn, Uralkali’s share price ended the year at just $3.8bn. At the end...