The IAEA chief, Rafael Grossi said he hasn't yet met with Iranian President Ebrahim Raisi but hopes to do so soon to build a relationship based on 'mutual trust and confidence'.

'Our relationship with Iran is a permanent one, it's not predicated on the JCPOA or other things.

It's a permanent relationship based on their membership on the Treaty on the Non-Proliferation of Nuclear Weapons, which requires all countries in the world to have a system of inspections,' he told Euronews.

'Of course, there are ups and downs as in any relationship, and we are always making every possible effort to keep it at a good level.

And this has been my message all along', Grossi added.

The director called on Tehran to allow the agency to replace the monitoring and surveillance equipment installed in the country's nuclear sites.

'I think diplomacy cannot fail.

We have to make sure that every element is there and it is possible to have a sort of a modus vivendi,' he said.