The International Atomic Energy Agency is seeking agreement on a resolution concerning Iran's nuclear program.
The IAEA Board of Governors meets next week, hoping to break a deadlock on how far to go in censuring Iran.
The United States says Iran only admitted to a sophisticated uranium enrichment program, after the program was discovered. The U.S. ambassador to the IAEA, Kenneth Brill, accused Iran of deliberate deceit. He said Iran's production of plutonium had only one purpose - to build nuclear weapons.
The United States wants the board to declare Iran in non-compliance with international obligations, and wants a report to go the U.N. Security Council.
If this happens, Iran has hinted it could review its recent cooperation with the IAEA. The Iranian envoy to the atomic energy agency, Ali Akbar Salehi, told reporters, Tehran has already reached an understanding with Britain, France and Germany.
"Our cooperation with the Europeans, it embodies all the elements together of both the additional protocol and the enhancement of our cooperation with the agency [IAEA] and the voluntary suspension of the enrichment program," he said. "They all go together, so it's a package."
However, western diplomats say, not all European countries are happy with the way they say Britain, France and Germany presume to set foreign policy for the 15-nation European Union.
The IAEA board reconvenes Wednesday in Vienna.