World Bulletin / News Desk
Gazprom said in a statement that Ukraine had 219 million cubic metres (mcm) of gas left that would be used up in two days. With no new payment, Russia would be forced to stop supplies to Ukraine, Gazprom added.
On Monday, Ukrainian state energy firm Naftogaz accused Gazprom of failing to supply gas that Kiev had paid for in advance, days after Moscow said it was sending some gas destined for Ukraine directly to regions held by rebels.
After cutting off Ukraine's gas for six months, Moscow resumed supplies in late-2014 when the two sides signed an interim agreement, under which Kiev would pay off some of its debts and pre-pay for supplies for the winter.
Naftogaz said the Russian firm had broken this deal by delivering only 47 mcm of a 114 mcm order that Kiev had paid for in advance last Thursday.
A Gazprom spokesman said the supplies to the rebel regions were being shipped under a contract with Naftogaz.