Japan’s Foreign Minister Toshimitsu Motegi. (Photo: EPA)

The nuclear deal is officially known as the Joint Comprehensive Plan of Action (JCPOA).

The same day, Iran’s Foreign Minister-designate HosseinAmir-Abdollahian said Iran is willing to engage in "reasonable" negotiations that serve the Iranian people's interests.

Earlier, Motegi met Iraqi President Barham Salih and Foreign Minister Fouad Hussein in Baghdad.