KYIV, Dec 20 - Gazprom is working to have the gas volumes it supplies to territory in the Donbas not under Kyiv's control held out of its dispute with Naftogaz Ukrayiny in the Arbitration Institute of the Stockholm Chamber of Commerce, Naftogaz Chief Commercial Director Yuriy Vitrenko said Wednesday.

Gazprom argues there should be no decision on gas volumes supplied to the territory [not controlled by Kyiv]. We, in turn, are saying that any calculation is the price multiplied by volume. Without knowing the volume, it is impossible to say who owes what to whom," Vitrenko said.