Russia and China on Monday launched 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 hailed the “Power of Siberia” pipeline as a symbol of cooperation. “Today is remarkable, a truly historic event not only for the global energy market, but first of all for us and for you, for Russia and China,” Putin said.