When President Hassan Rouhani of Iran commandeered the spotlight this week in Davos, Switzerland, with a message of peaceful intentions and a desire for dialogue, it was an eerie echo of 10 years ago, when Iran’s last would-be change agent, Mohammad Khatami, delivered the very same message at the World Economic Forum . Comparing their appearances demonstrates how much Iran has changed in the last decade, but also how fragile the current diplomatic opening is, and how little time Mr. Rouhani may have to negotiate a nuclear deal, while holding Iran’s hard-liners at bay. Iran, Mr. Rouhani said Thursday, was determined to pursue “constructive engagement” with the world and had no intention of acquiring a nuclear weapon. In 2004, Mr. Khatami said, “Anywhere that we sense and feel that the other side respects us and does not force anything upon us, we are prepared to talk.” He, […]