Peter Rodman, assistant secretary of defense for international security, on Thursday called China to re-evaluate its relationship with Iran and North Korea, two countries with which the United States is locked in tense nuclear standoffs.

Rodman said Washington sees "a general willingness (of China) to transfer a wide variety of technologies to customers around the world."

China has denied the charges and says it opposes the spread of weapons technology and materials. It also says it forbids Chinese companies from transferring such material and technology.