Gazprom has reaffirmed its Monday deadline for Ukraine to pay its debts after talks between Moscow and Kiev ended without agreement.
The Russian gas giant said it will cut Ukraine’s supply if Kiev fails to pay $1.95bn (£1.15bn) by 06:00 GMT.
“We reached no agreement. The chances that we meet again are slim,” Gazprom spokesman Sergei Kuprianov said.
Ukraine’s discounted rate for gas was axed by Moscow after protests removed pro-Russia President Viktor Yanukovych.