KIEV, March 1 – Naftogaz Ukrayiny, in pursuance of a ruling by the Arbitration Institute of the Stockholm Chamber of Commerce, has returned about seven billion cubic meters of natural gas to Swiss-registered gas trader RosUkrEnergo, Naftogaz CEO Yevhen Bakulin told reporters.

At the same time, he declined to specify the deadline for the return of 12.1 billion cubic meters of gas to RosUkrEnergo.

"The repayment schedule will depend on the temperature conditions," Bakulin said Tuesday on the sidelines of the Ukrainian energy forum organized by the Adam Smith Institute.