KYIV, March 30 – The national energy company Naftogaz Ukrayiny in April could start recovery of $2.5 billion debt from Russia's Gazprom to execute the award of the Arbitration Institute of the Stockholm Chamber of Commerce, Naftogaz Chief Commercial Officer Yuriy Vitrenko said.

"[The appeal to courts] could start in the near future, in April. We have warned them," he said on the 24 Channel TV late on Wednesday.