The Ukrainian government insists Russia increased gas prices for political reasons.
A Gazprom spokesman declined to say what action, if any, the company would take if Kiev did not meet the deadline - which falls on the seventh day of each month - for settling its monthly bill.
Ukraine has missed deadlines in the past without punishment but Gazprom has suggested it might ask Kiev to pay in advance for gas, which could cripple the country's infrastructure.
Gazprom previously cut off gas supplies to Ukraine in price disputes in the winters of 2005 and 2008.
Meanwhile there has been an outcry among German trade leaders over strict sanctions imposed on Russia by the West.
Germany's engineering sector could be derailed if the EU imposes strict sanctions according to trade body VDMA, which represents 3,000 firms including electronics manufacturer Siemens.
The EU, United States and other Western nations have already imposed sanctions in response to Russia's seizure of Crimea and have threatened broader economic penalties if it moves into southern and eastern Ukraine.
But VDMA President Reinhold Festge told a trade fair in Hanover: 'It is absolutely clear that there has been a blatant breach of international law... It is also clear that it is necessary to draw the line.
'You have to know what you are doing when you continue to escalate, yelling and screaming.'
Russia is Germany's 11th largest commercial partner, with trade reaching 76.5 billion euros last year.
Joe Kaeser, head of German conglomerate Siemens, met Russian President Vladimir Putin in Moscow last month to secure his firm's interests, drawing criticism from some German politicians.
