IENNA - The UN nuclear watchdog chief said Friday he now has "a better understanding on some ways forward" over enhancing the transparency of Iran's controversial nuclear activities.

The International Atomic Energy Agency (IAEA) Director General Yukiya Amano met with Iranian President Hassan Rouhani and Ali Shamkhani, head of Iran's Supreme National Security Council, in Tehran on Thursday.

Amano visited Iran in the context of the IAEA's continued engagement with Iran and EU+3 countries -- Britain, China, France, Germany, Russia and the United States -- as they work toward a Joint Comprehensive Plan of Action.

"I believe that both sides have a better understanding on some ways forward, though more work will be needed," Amano said.

It is believed that Amano's Iran visit aims to find a solution to the past so-called "possible military dimensions" of Iranian nuclear activities and to enhance the monitoring measures on Iran's current and future nuclear plan.(Xinhua)