The two Middle East powerhouses had held several rounds of dialogue in Iraq and Oman before reaching the agreement to mend ties on March 10 in China.
Recent diplomatic rapprochement between Riyadh and Tehran has paved the way for the swap of nearly 900 detainees held by rival forces in war-torn Yemen.
Experts say that staying ‘neutral’ in its global engagements might become difficult for Beijing in the long term.
Saudi state news agency says both foreign ministers spoke by phone for the second time in a few days.
Iranian Consultative Center in Syria warns the US against carrying out further strikes in Syria, saying its forces "we will have to retaliate."
Iran has been swept by protests since the death of 22-year-old Mahsa Amini in the custody of the country's morality police last September.
Deal between Tehran and Moscow comes after the expiry in October 2020 of restrictions on Iran purchasing conventional weapons under a UN resolution, and the jets could be delivered within the next year.
Iran expresses its readiness to provide further information and access in connection with an investigation into uranium traces at undeclared sites.
Video taken following one of the latest poison attacks shows a man assaulting a woman outside a school for girls in Tehran, igniting a new wave of anger against the government.
Tehran has repeatedly vowed to avenge the killing of Soleimani, the head of the Revolutionary Guard Corps' foreign operations, in a US drone strike on Baghdad airport in January 2020.
The White House says Tehran is seeking to acquire additional military hardware from the Kremlin as it supplies Moscow with its domestically-manufactured arms.
Tehran calls in Britain's charge d'affaires Isabelle Marsh, to protest allegations that Tehran made "threats" to the lives of UK-based journalists that forced the shutdown of the Iran International television operation in London.
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