TEHRAN (Press Shia) – International Atomic Energy Agency (IAEA) Director-General Yukiya Amano described implementation of a landmark nuclear agreement between Iran and world powers as fragile, warning that small mistakes could have grave consequences.

"The implementation of the agreement is still fragile," Amano said in an interview with the German news agency DPA published on Friday before a trip to Germany.

"Small technical mistakes, small failures in implementation can become big political issues that could have a large negative influence on the agreement," he added.

Amano's agency has reported that Iran so far has stayed within the terms of the agreement, according to Reuters.

"There is little trust," Amano said, referring to the United States and Iran.

While the Joint Comprehensive Plan of Action (JCPOA), a 159-page nuclear agreement between Iran and the Group 5+1 (Russia, China, the US, Britain, France and Germany) came into force in January, some Iranian officials complain about the US failure to fully implement the accord.

In March, Leader of the Islamic Revolution Ayatollah Seyed Ali Khamenei said Americans have yet to fulfill what they were supposed to do as per the nuclear deal.

Iran still has problems in its banking transactions or in restoring its frozen assets, because Western countries and those involved in such processes are afraid of Americans, the Leader said at the time, criticizing the US for its moves to prevent Iran from taking advantage of the sanctions removal.