Ebrahim Raisi inaugurated as President of Iran, a country whose hopes of shaking off a dire economic crisis hinge on reviving a nuclear deal with world powers.
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Raisi, a conservative, replaces moderate President Hassan Rouhani, whose landmark achievement was the 2015 nuclear agreement between Iran and six major powers.
Raisi won a presidential election in June in which more than half the electorate stayed away after many heavyweights were barred from standing.
A former judiciary chief, he has been criticised by the West for his human rights record.