China's Sinopec's deal to develop the Yadavaran oil field is being delayed because the rate of return Iran offered the Chinese was too low.

CENTERFORSECURITYPOLICY: Bankrupting Iran is not enough

China is the most important investor in Iranian exploration and extraction operations, and has been selected to develop the Azadegan and Yadavaran oil and natural gas fields, and the South Pars field.

FORBES: The Most Important Energy Developments Of 2012