The board of governors of the UN nuclear watchdog issued a resolution on Thursday criticising Iran for its lack of cooperation, prompting Tehran to threaten that the decision would affect their cooperation, according to "Barron's" magazine.
Iran expressed concern that the resolution's adoption could "impact the process of our country's collaboration" with the Vienna-based International Atomic Energy Agency (IAEA).
"We firmly believe that this resolution will have no result... it is intended to justify more unilateral sanctions against the Iranian nation," said Mohsen Naziri-Asl, Iran's envoy to the IAEA, according to the official IRNA news agency.
The motion, which was proposed by the US, UK, France, and Germany but was rejected by China and Russia, is the second of its sort in the past six months and comes at a time when negotiations over undeclared uranium particles discovered in Iran are at a standstill.
The 35-nation IAEA board approved the resolution with a vote of 26 for, 2 against, 5 abstentions, and 2 countries not present, diplomats told AFP.
Washington, London, Paris, and Berlin made the decision to apply more pressure after seeing no improvement in recent months.
This is the second critical resolution this year—the first was in June—that addresses the issue of Iran's failure to provide "technically credible" explanations for the particles.
The resolution emphasises that Iran must "act to fulfil its legal commitments" immediately.
The IAEA has been putting pressure on Iran to respond to the discovery of previously unreported man-made uranium at three facilities, and has demanded "access to locations and material" in addition to the gathering of samples.
The US envoy to the UN in Vienna stated in a statement to the board prior to the resolution's adoption that "Iran must now offer the essential cooperation, no more hollow promises."