Rafael Grossi, the head of the International Atomic Energy Agency, told reporters late Tuesday that the effort to end the war between Tehran and Washington is a “complex process” and that it’s important to allow “continuity” for that process to play out.

“I think it’s very important that an opportunity for peace is given,” he said.

Grossi, who is currently running to become the next UN secretary-general, also warned both sides that any peace deal must include the IAEA from the start to enforce oversight over Iran’s nuclear program.

Otherwise, he added, “you will have an illusion of an agreement.”