Gazprom has given Ukraine's government six more days to pay $3.5 billion in outstanding gas charges. It comes as the Ukraine crisis deteriorates in the east, where pro-Russian forces are clashing with the Ukraine military.
Ukraine's new president-elect Petro Poroshenko faces a stiff challenge in prosecuting an "anti-terrorist" operation in eastern Ukraine, where a border patrol camp has come under heavy fire.
Russian fighters are among the separatist forces battling Ukraine's poorly equipped military for control of eastern provinces. A pullback of Moscow's troops could defuse tensions with the West.