Twenty-one hours of negotiations in Islamabad produced nothing. Vice President Vance, Steve Witkoff, and Jared Kushner sat across from senior Iranian officials — including the speaker of the Iranian Parliament — and walked away without an agreement. The sticking point, as Vance framed it, was Iran’s unwillingness to make a “fundamental commitment” not to develop a nuclear weapon or the means to quickly build one. That’s a reasonable bar to set. It’s also one Iran was always unlikely to clear under these conditions.