Ukrainian President Volodymyr Zelenskiy is set to hold a telephone call with his Iranian counterpart Hassan Rouhani after Tehran said it had mistakenly shot down a Ukrainian passenger jet, the Ukrainian president’s office says.

Iran "deeply regrets" the accidental shooting down of a Ukrainian airliner earlier this week, Iranian President Hassan Rouhani says in a tweet.

A US strike killed top Iranian commander Qasem Soleimani at Baghdad's international airport Friday, dramatically heightening regional tensions and prompting arch enemy Tehran to vow "revenge".

Iranian President Hassan Rouhani's brother enters prison to begin a five-year sentence after he was convicted of corruption, the semi-official ISNA news agency reports, citing his lawyer.

Iranian President Hassan Rouhani reiterates on Sunday that Tehran would remain committed to its 2015 nuclear deal if its interests can be protected and says the US withdrawal from the accord is a "violation of morals".

President Hassan Rouhani says on Sunday Iran has plans to respond to any move by US President Donald Trump on the 2015 nuclear agreement and the United States would regret a decision to exit the accord.

Iranian President Hassan Rouhani declares the end of Islamic State in an address broadcast live on state TV.

Iran demands an apology from Saudi Arabia over the deaths of 769 people at the hajj pilgrimage, accusing its rival of seeking to evade blame.