Following three decades of mutually hostile postures characterized by minimal communication and limited and sporadic cooperation, the United States and Iran may be about to reengage more constructively.

Such a development, while important for us, would be of even greater significance for the greater Middle East and beyond. Its impact on a variety of relationships, including that between the United States and Israel, and those between Israel and its neighbors, would be transformative and positive. But much must happen by way of careful and persistent diplomacy to get the various moving parts in place. As Washington proceeds to restructure what is probably the key relationship in the region — namely, that between itself and Iran — it would do well to consider how another country has approached its own relations with Iran, in good times and bad. That country is Russia.