A trio of international law firms have won roles on a $1.6bn (£1.0bn) Russian energy deal as Gazprom moves to grow its share of the market.

Cleary Gottlieb Steen & Hamilton has advised Gazprom on the deal, which closed last week (23 September) and saw the Russian energy giant buy a 51% stake in SeverEnergia from Italian utility companies Enel and Eni.