The Iranians sum it up in a sentence: the problem is not the mediation, but the American disavowal.

The Iranians sum it up in a sentence: the problem is not the mediation, but the American disavowal.

This indicates that it is the American mood that disrupts the understandings, and therefore Tehran insists that Washington first implement the terms of all the understandings so that what happened after the signing of the memorandum of understanding is not repeated.

The principle of step by step failed at the last stage, and it strengthened the distrust and raised the level of fears among the Iranians, who behave as if the war would return.