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"Last winter, our reverse cost Gazprom about $6 billion in lost revenue excluding court fines. How much – we'll know soon," Kobolev said.

According to him, this winter was the first in the history of independent Ukraine, when the country could survive through the heating season without gas purchases from Russia.

Read alsoNaftogaz estimates total claims against Gazprom at $30 bln"Winter of 2015-2016 is the first in the history of independent Ukraine, which we have spent in warmth and comfort, and without purchasing a single cubic meter of gas from the Russian Federation. And it's not because of geopolitics, but because we can buy cheaper in Europe than in Moscow, as much as Ukraine needs," he said.

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