President Maithripala Sirisena and his Iranian counterpart: Hassan Rouhani signed the agreements.
"The U.S. withdrawal.is a violation of morals, the correct way to carry out politics and diplomacy and against worldwide regulations", Rouhani during a meeting with visiting Sri Lanka President Maithripala Sirisena.
Rouhani stressed the need to achieve Iran's economic interests as a condition to continuing with the nuclear deal.
Iran and Sri Lanka also signed a memo on cooperation in cultural, scientific and educational field to increase exchange of knowledge and students between the two sides.
In what is seen as a last-ditch effort to save the accord after Washington's withdrawal, Iranian foreign minister Mohammad Javad Zarif has embarked on a tour of world powers.
China's Foreign Minister Wang Yi said Zarif's tour would improve understanding of Iran's position and help Tehran protect its legitimate interests.
"It is clear to me that we can not prevent an Iranian nuclear bomb under the decaying and rotten structure of the current agreement", Trump continued.
The three European states have recommitted to the agreement, but senior cleric Ayatollah Ahmad Khatami said on Friday that Europe was not to be trusted.
The Assembly of Experts is an elected body of theologians charged by Iran's constitution with selecting and overseeing the Supreme Leader, the religious scholar who wields ultimate power in the Islamic Republic.
On Wednesday, Mr Jafari had cast doubt on European nations' ability to save the nuclear accord.
We will remind, on may 8 the President of the United States Donald trump announced its withdrawal from the agreement on Iran's nuclear program and has announced new sanctions against the Iranian regime.
"It's possible. It depends on the conduct of other governments", Bolton said on CNN's "State of the Union".