Russia and China gave their blessing to the Power of Siberia 2 pipeline but have yet to agree on pricing, Gazprom said on Tuesday, underscoring President Xi Jinping's disregard for Western demands that he row back from a deepening partnership with Moscow. The pipeline, which could one day deliver an additional 50 billion cubic metres (bcm) of gas per year to China through Mongolia from the Arctic gas fields of Yamal, hands the world's largest energy consumer greater options to hedge against...