Any links?
As far as I know Russia never just "cut off" delivery...
How many do you want?
Gas Dispute Has Effects Past Russia and Ukraine
At issue in the dispute, which threatens to cause heating fuel shortages in Europe at the time it is most needed, is a system of gas trunk pipelines that is a legacy of the Soviet Union.
nytimes.com/2009/01/04/world/europe/04russia.html
EU Suffers Gas Shortfall Amid Russia-Ukraine Row
Three years ago, Gazprom shut off gas supplies to Ukraine in a near-identical row over gas prices and allegedly unpaid bills, causing sudden shortages across much of Europe.
dw-world.de/dw/article/0,,3917096,00.html
Russian Gas Embargo on Ukraine Is Felt In E. Europe
Gazprom, the Russian gas monopoly, cut off deliveries to Ukraine on Thursday, saying the former Soviet republic had failed to pay $2.1 billion in gas debts. Ukraine said it paid $1.5 billion but was disputing more than $600 million in late fees.
washingtonpost.com/wp-dyn/content/article/2009/01/03/AR2009010301738.html
Russia gas disruption spreads to Czechs, Turks
"If Europe ... does not help us get out of this situation, then it can expect a more aggressive position from Russia on gas and other issues," Oleksander Shlapak, a senior Ukrainian presidential aide, told Reuters.
Russian gas export monopoly Gazprom blamed Ukraine for siphoning off or blocking deliveries of gas equivalent to one sixth of the total Russian supply to Europe, and said it was increasing exports to make up some of the shortfall.
washingtonpost.com/wp-dyn/content/article/2009/01/04/AR2009010400252.html