The International Atomic Energy Agency (IAEA) said Thursday that it was ready to begin defining the “concrete steps” that will need to be taken to implement a US-Iran deal.“Now it’s for us to sit down with our American colleagues, our Iranian colleagues, and start formulating the concrete steps that will have to be taken,” IAEA chief Rafael Grossi told reporters in Geneva.For all the latest headlines, follow our Google News channel online or via the app.His comments came after US President Donald Trump and Iran’s president signed a deal Wednesday meant to end the Middle East war, with Tehran agreeing to dilute its enriched uranium in return for large-scale economic relief.Under the terms of the deal released by US officials, Iran will dilute its enriched uranium stocks, possibly by “down-blending on site under the supervision of the IAEA” -- the UN’s nuclear watchdog.“This is a very complex operation and it’s not a secret so we will have to be very very detailed,” Grossi said, insisting his agency was the right one to oversee the process.“The fact that in this memorandum of understanding that has been signed, the indispensable role of the IAEA is recognized.... I think it says it all in terms of our credibility and the indispensable role we have to play,” he said.The agreement is only a temporary arrangement meant to give time for starting detailed negotiations on the far more complex issue of long-term control over Iran’s nuclear power ambitions, which Washington has long suspected of harboring a secret bomb-making program.“I think it’s good that the memorandum is there,” Grossi said.“Now the technical work starts.” Read more: UN nuclear watchdog raises ‘proliferation’ fears over Iran sites