Iran unveiled its first domestic fighter jet on Tuesday, with President Hassan Rouhani insisting that Tehran's military strength was only designed to deter enemies and create "lasting peace".

Iranian President Hassan Rouhani said on Saturday the United States was more isolated than ever over sanctions against Iran, even among its allies.

President Hassan Rouhani promised Iranians the government would be able to handle the economic pressure of new US sanctions, a day after traders massed outside parliament, protesting against a sharp fall in the value of the national currency.

"The US withdrawal ... is a violation of morals, the correct way to carry out politics and diplomacy and against international regulations," Rouhani during a meeting with visiting Sri Lanka President Maithripala Sirisena.

US President Donald Trump announced on Tuesday that he was pulling out of the landmark 2015 nuclear accord, calling it "defective at its core".

Iranian President Hassan Rouhani said on Monday the United States would regret a decision to leave Iran's 2015 nuclear deal with world powers and Tehran would fiercely resist US pressure to limit its influence in the Middle East.

Iranian President Hassan Rouhani has criticised the ban imposed on popular messaging app Telegram by the conservative-run judiciary, saying the move was "the opposite of democracy".

Iran's President Hassan Rouhani on Wednesday questioned the legitimacy of demands for a fresh nuclear agreement with Tehran, after the leaders of the US and France called for a "new" deal.

Iranian President Hassan Rouhani attacked the United States and Israel for their roles in Syria before he boarded a plane for Turkey where he was scheduled to meet President Tayyip Erdogan and visiting Russian President Vladimir Putin.

Iran's President Hassan Rouhani on Sunday called for a "year of unity" after recent protests as Iran celebrated 39 years since the Islamic revolution.

Ten people were killed overnight in the worst violence yet seen in Iran's protests, local media reported Monday, as President Hassan Rouhani vowed those breaking the law would be dealt with.

US President Donald Trump's decision to recognize Jerusalem as Israel's capital shows that the United States lacks any respect for the legitimate rights of the Palestinian nation, Iranian President Hassan Rouhani tweeted on Wednesday.