From Our Own Correspondent

Kate Adie introduces dispatches on Iran, Ukraine, South Africa, Portugal and Hong Kong.As the world nervously watches the developments between Iran and Israel, Lyse Doucet reflects on the rise of Iran's Supreme Leader, Ayatollah Ali Khamenei. Since coming to power three decades ago, he has managed to avoid taking Iran into an all-out war - could that change as tensions continue to rise?A missile attack in the Ukrainian city of Chernihiv this week laid bare the weakness of the country’s air defences. Depleted ammunition supplies, as well as a worsening situation on the frontline, have heightened fears that the tide is continuing to turn against Ukraine in its war with Russia. Sarah Rainsford reports from Kharkiv.South Africa is preparing to go to the polls, and for the first time since the end of white-minority rule, the governing ANC party is predicted to get less than 50 per cent of the vote. As in many other countries, immigration is high on the list of many voters’ concerns. Jenny Hill reports from the bor