U.S. Approved Business With Blacklisted Nations
"...China Precision Machinery Import Export Corporation. In an interview, Mr. Liu said he had chosen the company because the electrodes available in the United States were harder to find and more expensive. Two days later, the Bush administration barred American citizens from doing business with the Chinese company, which had already been penalized repeatedly for providing missile technology to Pakistan and Iran. ..."
Reference: www.nytimes.com .