Greece held "constructive" talks with the head of Russian gas giant Gazprom (GAZP.MM) who visited Athens on Tuesday and hopes that the two sides would soon reach a deal on a pipeline that will bring Russian gas to Europa via its territory.

• April 21, 2015

The European Union will launch a legal attack on Russian gas giant Gazprom (GAZP.MM) this week, ramping up tensions with Moscow, when antitrust agents will accuse it of overcharging buyers in eastern Europe, EU sources told Reuters on Monday.

• April 20, 2015

Crude oil futures rose on Tuesday on signs of falling U.S. oil production, weakness in the dollar and tensions in the Middle East, particularly Yemen.

• April 14, 2015

Russian traders, analysts and industry players on Tuesday questioned Moscow's announcement that a long-heralded oil-for-assets barter deal with Iran was already being implemented, saying they saw no signs of extra trade.

• April 14, 2015

As the United States and Iran come closer to a historic nuclear deal, many U.S. states are likely to stick with their own sanctions on Iran that could complicate any warming of relations between the long-time foes.

• April 13, 2015

The former head of CNPC, China's top energy group, on Monday admitted his guilt and asked for leniency at the opening of his trial on charges of bribery and abuse of power, the latest in a string of top officials caught in an anti-graft campaign.

• April 13, 2015

U.S. Secretary of State John Kerry defended on Sunday his presentation of a framework agreement on Iran's nuclear program after a different interpretation was offered by Iran's supreme leader, and a prominent U.S. senator said Kerry was "delusional."

• April 12, 2015

Ukraine has signed an interim deal for cheaper supplies of gas from Russia for the next three months, providing a breathing space for both sides in their protracted wrangle over pricing, Ukrainian energy officials said on Thursday.

• April 2, 2015