Rafael Grossi, head of the International Atomic Energy Agency (IAEA), arrived in Tehran on Monday and was expected to meet Foreign Minister Hossein Amir-Abdollahian and Atomic Energy Organization chief Mohammad Eslami, who is also one of Iran's vice presidents.

Foreign ministry spokesman Saeed Khatibzadeh told reporters that Iran has always advised the IAEA to stay on the path of technical cooperation, and to not let certain countries pursue their political interests through the IAEA.

Grossi last visited Tehran in September, when he obtained Iran's approval for international access to monitoring equipment at Iranian nuclear facilities.

The 2015 deal, known as the Joint Comprehensive Plan of Action (JCPOA), was designed to curtail Iran's nuclear program in exchange for sanctions relief.