Ukraine's state-run energy company Naftogaz has suspended gas payments to Russia until the conclusion of price talks, chief executive Andriy Kobolev was quoted as saying on Saturday.

• April 12, 2014

Gennady Timchenko, the billionaire Russian gas trader hit with U.S. sanctions over his alleged ties with the Kremlin following Russia's annexation of Crimea, said being singled out by Washington was a badge of honor.

• April 12, 2014

Russian gas exports to Ukraine have been falling since early April, a gas industry source said on Friday, declining to give a reason for the reduction.

• April 11, 2014

Ukraine said on Friday it would turn to Europe for gas and won a promise of help from Brussels after Russia warned it could cut supplies over Kiev's refusal to pay Moscow's "political, uneconomic price" for supplies.

• April 11, 2014

Japan's cabinet on Friday approved an energy policy reversing the previous government's plans to gradually mothball nuclear power plants, a move likely to be unpopular with a wary public following the 2011 Fukushima disaster.

• April 11, 2014

President Vladimir Putin warned European leaders on Thursday Russia would cut natural gas supplies to Ukraine if it did not pay its bills and said this could lead to a reduction of onward deliveries to Europe.

• April 10, 2014

Russia raised the gas price for Ukraine on Thursday for the second time this week, almost doubling it in three days and piling pressure on a neighbor on the brink of bankruptcy in the crisis over Crimea.

• April 3, 2014

Russian natural gas producer Gazprom announced a more than 40 percent increase in the price of gas for Ukraine on Tuesday, stepping up economic pressure on Kiev in its crisis in relations with Moscow.

• April 1, 2014