KIEV, Oct. 7 – Naftogaz Ukrayiny head Andriy Kobolev has denied the accusation of Yulia Tymoshenko that TrailStone, which sells gas to Naftogaz, is operating in collusion with top officials.

"In fact, TrailStone was organized in April 2013 by the team that previously worked at leading positions in Deutsche Bank. Riverstone Holdings private investment firm was founded in 2000 with offices in New York, London, Huston and Mexico became investor in TrailStone. Over the period of its operation the firm invested around $30 billion in over 110 companies in North America, Latin America, Europe, Africa and Asia," Kobolev wrote on his Facebook page.