The head of the United Nations atomic watchdog Yukiya Amano arrived in Tehran Monday for talks with President Hassan Rouhani, two days after Iran’s nuclear deal with world powers went into force.

The head of the United Nations atomic watchdog Yukiya Amano arrived in Tehran Monday for talks with President Hassan Rouhani, two days after Iran's nuclear deal with world powers went into force.

The International Atomic Energy Agency confirmed late Saturday that Tehran had complied with its obligations under last summer's accord, leading the United States and the European Union to lift sanctions imposed over Iran's nuclear program.

"The duration of the nuclear agreement is eight years but we want to shorten this period and this is possible with the help of the Agency," the official IRNA news agency quoted Behrouz Kamalvandi, the spokesman of the Iranian Atomic Energy Organization, as saying on Monday.

Kamalvandi was referring to a clause in the nuclear agreement which provides for a period of eight years during which Iran has to limit its atomic program.

Kamalvandi stressed that Amano will not visit any nuclear site in Iran.

On Saturday, Iranian Foreign Minister Mohammad Javad Zarif and European Union foreign policy chief Federica Mogherini read out a joint statement in the Austrian capital, Vienna, announcing that the deal, know as the Joint Comprehensive Plan of Action (JCPOA), had come into force.

According to the statement, all nuclear-related sanctions imposed on Iran by the European Union, the UN Security Council and the US are lifted.

On the same day, the IAEA confirmed that Iran has remained committed to the nuclear agreement with the world powers.

Amano announced that Iran had taken the necessary preparatory steps to start the implementation of the JCPOA.