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Kupriyanov added that the supply to Europe will continue as planned and Ukraine has the obligation to make sure the gas will reach European customers.
Gazprom said in a statement, however, that it had notified the European Commission of "a possible disruption in the gas transit" in case Ukraine decides to siphon off the gas.
Cash-strapped Ukraine has been chronically behind on payments for the gas needed to heat homes and fuel its industries.
Gazprom offered the previous president, Viktor Yanukovych, a discounted price of $268.50 per thousand cubic meters after he backed out of an economic and political agreement with the European Union opposed by Russian President Vladimir Putin.