Direct U.S.-Iranian negotiations in Geneva and Vienna this month over Iran's nuclear program demonstrate something very positive about the prospects for U.S. diplomacy with Iran: When given the chance to engage directly with the United States, Iran will take that chance and pursue negotiations in an active and constructive way.
This does not mean that Iran will automatically give the United States what it wants. But it does mean that Iran will approach negotiations with the United States in a rational manner grounded in Iranian national security interests. This should not come as a surprise: It is how Iran has approached previous episodes of engagement with the United States -- including two years of extremely constructive official talks between the U.S. and Iran over Afghanistan and al Qaeda, following the 9/11 attacks (talks in which I directly participated).
Now that Tehran has asked for an extension of the deadline for its response to a proposal to ship most of Iran's low enriched uranium out of the country for fabrication into fuel rods, it is important to remember Tehran's history of pragmatic cooperation and avoid distorting events or overreacting.