Naftogaz CEO Oleh Dubyna said at a meeting with Gazprom head Alexei Miller on Thursday that it was increasingly difficult for the Ukrainian energy company to make gas payments and it could be problematic for it to pay for natural gas supplied in October, the source said.
Naftogaz paid for Russian natural gas deliveries in September on time and in full, largely using borrowed funds.
According to the source, the Russian side insists that Naftogaz comply with contractual obligations in terms of natural gas purchase volumes and prices.
Ukraine is currently negotiating with Gazprom on a reduction in supplies to 33 billion cubic meters a year.
Miller has said that under the contract, Ukraine must buy at least 52 billion cubic meters of gas per year, but Ukrainian Prime Minister Yulia Tymoshenko said that "Ukraine has the right to order the volume that it needs."
She said the contract provides for 20% fluctuations in the level of consumption, and that "aggressive statements" on mandatory purchase levels should be ignored.
Russia, which supplies around one fifth of Europe's gas, briefly shut down supplies via Ukraine's pipeline system at the start of the year during a dispute with Kiev over unpaid debt.
The conflict was resolved in January, when Russian Prime Minister Vladimir Putin and his Ukrainian counterpart, Tymoshenko, agreed deals on deliveries to and gas transit through Ukraine for 2009.
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