Obama issued a statement, said he had been ordered to take additional sanctions on Iran's energy and petrochemical sectors, aimed "to block Iran to pay the way for the purchase of Iranian oil, to prevent Iran evade existing sanctions and the United States the framework of the existing sanctions be used.

Obama said, after the introduction of a new round of sanctions, the purchase of or access to Iran's petrochemical products will be subject to U.S. sanctions. Meanwhile, the U.S. will seek to evade sanctions, to the National Iranian Oil, naf of Tiran international trading company and the Central Bank of Iran to provide material support or help the Iranian government to purchase or access to individuals and entities of the United States notes, or precious metals to the imposition of sanctions.

Obama said the latest sanctions that the United States is determined to Iran responsibility to adhere to its uranium enrichment program, even though the United States remains committed to resolve the Iranian nuclear issue through diplomatic channels.

Iran insists its nuclear program is only for power generation and medical purposes, but the Western countries that Iran is secretly seeking to develop nuclear weapons. Since mid-April, Iran for its uranium enrichment program and the six countries, including Britain, France, China, Russia, the United States and Germany held three rounds of talks and two rounds of expert-level talks. (Aijun)