A nuclear armed Iran would be in China's strategic interest protecting Iran from an Iraq stle invasion and allowing the Chinese governemtn to invest in the Iranian oil fields. The Middle East is not exclusivly the playground of the United States, and as China replaces the US as a global superpower it is going to replace the United States influence in such places.
Week of floods kills 22 in Vietnam (DPA)
from the article: 'U.S. believes Chinese companies are helping Iran develop nukes'