Iran has dismissed a security official over the attack on the Saudi Embassy in Tehran, which led Riyadh and several of its allies to cut or downgrade ties with the Islamic republic.
Iranian President Hassan Rohani has predicted Iran will undergo an "economic boom" with the lifting of international sanctions.
The European Union foreign-policy chief said she expects economic sanctions against Iran to be lifted soon.
Foreign ministers from countries in the Arab League have condemned Iran for what they say is meddling in Arab affairs and undermining regional stability.
Iranian Foreign Minister Mohammad Javad Zarif has accused Saudi Arabia of using its escalating diplomatic row with Tehran to derail peace talks on the Syrian conflict.
The Sunni Arab monarchies of the Persian Gulf have expressed support for Saudi Arabia in its diplomatic row with Iran, condemning what they described as Iranian interference in Riyadh's internal affairs.
Executives from 25 news organizations urged U.S. Secretary of State John Kerry to press for the release of a Washington Post reporter jailed in Tehran.
Iran accused Saudi Arabia of "sectarian hate-mongering" and said the kingdom must choose between promoting extremism and fostering good relations in the Middle East.
Hila Sedighi, a popular Iranian poet who had in the past criticized state repression and campaigned for an opposition presidential candidate, has been detained by authorities, relatives said.
Thousands of Iranians held anti-Saudi protests across the country on January 8 condemning Riyadh's execution of a prominent Shi'ite cleric that has sparked renewed tensions between the two regional rivals.
Iranian Princess Ashraf Pahlavi, the twin sister of the last shah of Iran, has died at the age of 96.