REUTERS

Ukrainian Prime Minister Arseniy Yatsenyuk announced this on his Facebook page on Friday.

"Within six months after our first recourse to the arbitration institute regarding the [gas] transit contract [with Russia's Gazprom], leading international experts and lawyers have done a lot of work to clearly prove that the transit contract is unfair in relation to Ukraine, and more than $10 billion should be paid by Gazprom to Naftogaz as compensation of losses," he wrote.

"Thus, the total sum of our claims against Gazprom under the gas purchase transit contracts has already exceeded $16 billion," Yatsenyuk said.

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