Beijing, Ramadan 12, 1436, Jun 29, 2015, SPA -- The construction of a pipeline to bring gas from western Siberia to China began Monday following a decade of negotiations, dpa reported. The ceremony in China was marked by the welding of the first pipe joint, Russia's Itar-Tass news agency reported. The Power of Siberia pipeline is scheduled to become fully operational in 2018 and will link with existing Chinese gas infrastructure, Russia Today reported. --SPA 14:34 LOCAL TIME 11:34 GMT www.spa.gov.sa/w