Gazprom announced yesterday that it would stop supplying gas to Ukraine on 1 January if a dispute over prices was not settled.
Aleksei Ivchenko, chairman of Ukraine's gas company Naftogaz Ukrayiny, responded today by saying that Ukraine has enough gas reserves to last through the winter.
Gazprom wants to nearly quadruple the price of gas supplies to Kyiv.
Ukraine wants the hike to be phased in over several years. It also says Russia wants to punish Ukraine for its new pro-Western stance.