RosUkrEnergo, the secretive energy trader that controls gas supplies from central Asia to Europe, is planning a London stock market flototation to raise capital for big investments in gas supply infrastructure.

Dmytro Firtash, the 40-year-old Ukrainian businessman who has this week emerged as a key shareholder, on Thursday told the FT that it would invest in transit and storage facilities in cooperation with Gazprom, the Russian gas monopoly, which is biddiing to expand its presence in overseas markets, including in the European Union.