KYIV, March 1 – The debt of Russia's Gazprom to national energy company Naftogaz Ukrainy over the non-execution of the award of the Arbitration Institute of the Stockholm Chamber of Commerce to pay $2.56 billion has increased by almost $200 million, Naftogaz COO Yuriy Vitrenko said.

"We will make Gazprom comply with the transit award and pay us $2.56 billion with nearly $200 million in interest for the past year," Vitrenko said.