“We will extend a hand if you are unwilling to unclench your fist,” President Obama proclaimed in his inaugural address in January 2009. He characterized those to whom this was addressed in negative terms, but the implication was that this president, unlike his predecessor, would be willing to negotiate with and make concessions to unfriendly nations.

It is a promise he has striven to keep, with Russia initially and Cuba more recently, but most of all to the Islamic Republic of Iran. The hand has been extended, more than once. But has the fist come unclenched?