IAEA Director General Rafael Mariano Grossi says that “good words” from the Islamic Republic are not enough to satisfy international inspectors

Grossi expressed hope on Tuesday that Tehran is ready to be transparent about its nuclear program, which was “moving ahead very, very fast”.

When asked about the IAEA's role in monitoring any revival of Iran's 2015 nuclear deal with world powers under which it curbed its nuclear program in return for economic sanctions relief, he said Iran must grant IAEA inspectors access “commensurate to the size” of its uranium enrichment program if the agency is to credibly assure that it is peaceful.

“When it comes to nuclear, good words will not do it. What you need to do is to be transparent and compliant and work with us. We are ready and I hope they will be as well,” Grossi told reporters at the United Nations.

“They have a very ambitious nuclear program that needs to be verified in the appropriate way. The program is moving ahead very, very fast and not only ahead, but sideways as well, because it's growing in ambition and in capacity.”

Iran's nuclear chief Mohammad Eslami told reporters in Tehran on Mondaythat Iran is technically capable of building a nuclear bomb; a statement that has been made before by at least two other Iranian officials and has been generally taken as a defiant signal from Tehran. President Ebrahim Raisi also reiterated last week that the people of Iran have told him they want to resist rather than sign an agreement with the United States.