Russia and China launch a giant gas pipeline linking the countries for the first time, one of three major projects aimed at cementing Moscow's role as the world's top gas exporter. Presiding by video link-up over an elaborate televised ceremony, Russian leader Vladimir Putin and Chinese counterpart Xi Jinping hail the "Power of Siberia" pipeline as a symbol of cooperation. IMAGES of the pipeline and SOUNDBITES of the CEO of GazpromN°1MQ722