Russia is threatening to turn off the taps, claiming that Kyiv needs to pay for the gas that Russia's Gazprom is directing to rebel-held eastern Ukraine. Europe's own gas supplies could be affected if a shutdown occurs.
Russia's War Against Ukraine
Christian Science Monitor: Moscow, Kyiv locked into another gas dispute – who pays rebels’ bills
Welders repare a pipe outside a flat which was destroyed on the eve by shellings in the eastern Ukrainian city of Donetsk, controlled by pro-russian rebels, on Dec. 8, 2014.