This part below is towards the end of a long article:
http://www.atimes.com/atimes/China/GL21Ad01.htmlBeijing-Tehran-Moscow
At the end of 2004, Beijing signed a $70 billion energy agreement with Tehran, China's largest Organization of Petroleum Exporting Countries energy deal to date. China's state Sinopec agreed to buy 250 million tons of LNG over 30 years from Iran, as well as to develop the giant Yadavaran field. That agreement covered the comprehensive development by Sinopec of the giant Yadavaran gas field, construction of a related petrochemical and gas industry including pipelines.
As part of the huge Iran-China economic cooperation agreement, China's state-run military construction company, NORINCO, will expand the Tehran Metro underground. A second phase in the Iran-China strategic energy cooperation will involve constructing a pipeline in Iran to take oil some 386 kilometers to the Caspian Sea, there to link up with the planned pipeline from China into Kazakhstan.
On signing the deal, Iran's Petroleum Minister announced that Tehran would like to see China replace Japan as Iran's largest oil importer. As well, Iran has what are estimated to be the world's second largest reserves of natural gas after Russia. Iran is a place of enormous strategic importance to China, to Japan, to Russia, to the European Union, and for all these reasons, to Washington as well.
Energy is the Achilles' heel of China's economic growth. Beijing knows that only too well. So does Washington. A decision by Washington to take military action against Iran now would pull a far larger cast of actors into the fray than Iraq.