It worked well in the United Nations General Assembly last September, when he had something solid to offer – a deal on his country’s nuclear program – raising hopes that Iran’s hardline foreign-policy stance would finally soften. But UN Secretary-General Ban Ki-moon’s withdrawal of Iran’s invitation to the Geneva II conference on Syria suggests that Rouhani will need more than charm – or even a visit by Turkish Prime Minister Recep Tayyip Erdoğan to Tehran – to end his country’s isolation.