Ukraine warned Europe on Wednesday that Russia could cut off gas to the continent this winter, but Moscow responded that the supply of gas would continue regardless of politics.

• August 27, 2014

Russian natural gas exporter Gazprom (GAZP.MM) said on Thursday that Ukraine's outstanding debt for gas supplies stood at $5.3 billion as of Aug. 1 and called on Kiev to ensure that gas continues to transit without disruption to Europe.

• August 21, 2014

Russia's Rosneft (ROSN.MM), which produces more oil than Iraq or Iran, is seeking a $42 billion loan from a fund earmarked for Russian pensions to help it weather Western sanctions imposed over Moscow's role in Ukraine.

• August 14, 2014

The cost of petrol has risen in Crimea for the first time since Russia seized the Black Sea peninsula from Ukraine in March, despite a promise by Moscow to reduce the price.

• July 23, 2014

Ukrainian Energy Minister Yuri Prodan said on Wednesday reverse gas flows from the European Union to Ukraine had fallen because of opposition from Russian gas producer Gazprom.

• July 23, 2014

U.S. Secretary of State John Kerry said on Sunday major differences persist between Iran and six world powers negotiating on Tehran's nuclear program, with a week to go before a deadline for a deal.

• July 14, 2014

Russia said on Thursday talks between world powers and Iran were "extremely difficult" but Moscow still hoped a long-term deal to end the standoff over Tehran's nuclear program could be reached by July 20.

• July 10, 2014

Ukraine began preparing on Friday for Russia to cut off its gas after talks on long-running price dispute broke down, raising the prospect of supplies to the European Union also being disrupted from Monday.

• June 13, 2014