"The total process has been relatively satisfactory despite the difficulties that we see in the implementation," Hamid Baeidinejad told a press conference in Tehran for the first anniversary of the agreement.
"We belive that the deal has not been violated so far and efforts continue to resolve the remaining issues," Baeidinejad said.
The deal between Iran and the P5+1 group of powers (Britain, China, France, Germany, Russia and the United States) limited Tehran's atomic programme in return for the lifting of some international sanctions, which took effect in January.
Despite the lifting of nuclear-related penalties, Washington and the European Union maintain some sanctions on Iran over its human rights record and ballistic missile testing.
Asked if Iran had oversold the deal to its people, Baeidinejad said: "We knew exactly what was agreed upon in the deal and what was not."
He said Tehran "had more expectations on the removal of economic, banking and financial restrictions, but despite all these deficiencies there is a feeling of hope inside our country to remove these obstacles" through more talks.
The agreement caused "great optimism" in Iran on "unrelated issues", Baeidinejad said, but those expectations are "fortunately being balanced and adjusted to reality".
President Hassan Rouhani today also praised the "new atmosphere" created by the accord, saying it can lead to "better economic, defence, and technological activity" for Iran.
"In some fields, including banking, we still haven't reached the expected level, although good steps have been taken in this regard and some connections have been made with big international banks," Rouhani was quoted as saying by official news agency IRNA.
