Iran would be willing to work with the United States on a number of issues, including national nuclear program, if Washington changes its attitude towards Iran for the better, The Washington Post quoted Foreign Minister Kamal Kharrazi as saying, IRNA reported.

In an interview with the daily published Thursday, Kharrazi said that his government was willing to sign the additional protocol to non-proliferation treaty (NPT).

He said that the United States, for its part, would have to make it clear that signing the additional protocol would end the debate over Iran`s nuclear program.

"We want to make sure the additional protocol would be enough and would solve the problem," Kharrazi said.

"We don`t have anything to hide because we do not have a program for producing nuclear weapons. Therefore, we are ready to be quite transparent. But we cannot let others deny our rights," he added. Meanwhile, Kharrazi told The New York Times he was puzzled by Washington`s attitude toward Iran, saying that after the US-led war in April, the US administration abruptly stopped seeking cooperation with Iran.

"When it is decided to mend relations, we are serious about that," he said.

"But the problem is there is no room for that now. The environment does not allow it because Americans are always trying to suspect us, always tried to humiliate us and pressure us."

"But if they change their minds, if they change their approach and bring in a new environment for cooperation, we would be ready to work with Americans and cooperate," he said.