Iran's FM visits Saudi Arabia, Qatar before nuclear talks with US in Oman / Saudi Arabia's defence minister visits Iran ahead of US talks / Saudi defense minister visits Iran in highest-level trip in decades as nuclear talks proceed / Saudi defence minister visits Tehran before Iran-US talks / Saudi defence minister visits Tehran ahead of Iran-US talks / Saudi army chief in Iran on rare visit: state media / Iran’s president visits Saudi Arabia for the first time since the two mended ties. / Iran's foreign minister visits Saudi Arabia's powerful crown prince as tensions between rivals ease / Iran’s top diplomat extends Saudi trip, meets Crown Prince MBS / Iran's foreign minister visits Saudi Arabia's powerful crown prince as tensions ease