Russia and China agree on construction terms for the Power of Siberia 2 gas pipeline, but price and volume negotiations remain unresolved in a deal reshaping Eurasian energy.

Russia has been pushing for years to build a new pipeline to China to deliver billions of dollars' worth of natural gas to its close ally.

Putin is expected to hold talks with Chinese leader Xi Jinping on Wednesday, with the long-stalled Power of Siberia 2 natural gas pipeline topping the agenda.