Who moves first in Iran-US diplomacy?

For nearly two decades, one question has haunted Iran-US diplomacy: Who should move first? Since the early 2000s, Washington and Tehran have repeatedly faced the same dilemma: Should Iran limit its nuclear activities before receiving economic relief, or should the United States ease pressure before expecting Iranian concessions? Yet the latest diplomatic crisis suggests that these may no longer be the right questions. The real challenge is not who moves first. It is whether both sides can move together. This question has become urgent again amid the latest dispute over the Strait of Hormuz.