For the 6 powers — the US, Russia, China, France, Britain & Germany — the Iranian response's substance was just as disappointing as its style

In the NYTimes, here

"... both in their paper, and throughout the talks, the Iranians did not discuss the formula, called a “freeze for freeze.” As a result, they left the impression that they wanted to lure the parties into an open-ended, cost-free, high-level negotiating process. “The paper calls for a huge exercise in talking,” said one senior European official. “If you were to try to implement it, it would take a minimum of several years.”