KYIV, Nov 24 – The minimum investment in maintaining the stable operation of Ukraine's gas transportation system (GTS) is $200-300 million annually with the existing volumes of transit work, Chairman of Naftogaz Ukrainy Andriy Kobolev has said.

"The Ukrainian GTS has been audited by Mott MacDonald, which clearly defined the minimum amount of investment needed to maintain the system in case of transit at the existing level. This is approximately $200-300 million per year," he said on the air of the Priamy TV Channel.