KIEV, Sept. 19 – The change of Naftogaz Ukrayiny's charter by the Economic Development and Trade Ministry and the transfer of its subsidiary – public joint-stock company Ukrtransgaz – to the management of the ministry could have resulted in the refusal of the Arbitration Institute of the Stockholm Chamber of Commerce to hear Naftogaz Ukrayiny's claim against Russia's Gazprom on the 2009 transit contract, Naftogaz Ukrayiny Chairman Andriy Kobolev said.

"The most serious and gravest consequence that we can get is the refusal of the Arbitration Institute of the Stockholm Chamber of Commerce to hear the transit lawsuit against Gazprom. In this lawsuit Naftogaz demands $12 billion from Gazprom and the introduction of a possibility of virtual reverse mode, guaranteeing gas transit for the future and many other things," Kobolev told reporters on the sidelines of the 13th Annual Meeting of the Yalta European Strategy (YES) in Kiev on Saturday.