To be met with unrelenting threats, unsubstantiated accusations of being liars and subjected to a demeaning paternalistic “We Are Superior” posture, one could easily understand if Iran decided further discussions would be fruitless. This Israeli driven narrative is hardly creating an environment conducive to fair and constructive dialog.
If one wanted to sabotage a peaceful outcome to this historic moment, subjecting Iran to more crippling economic sanctions will certainly achieve that goal. The stance being projected by the Israelis during these first small steps is sure to undermine the efforts of those trying to avoid the military option.
Why anyone would intentionally chose a path guaranteed to lead to violence and bloodshed when diplomacy is showing signs of a breakthrough remains a mystery. This is a mystery that must to be solved and it must be solved quickly.
Western negotiators (P5+1) must determine amongst themselves if they actually have the authority to enter an agreement with the Iranians before proceeding further. For any hope of realizing a positive outcome from the next phase of the process, those participating at the highest levels must be able to maneuver unencumbered by hostile forces from the sidelines.
Bottom line: Considering the Israelis have already indicated any agreement, failing to meet all of its preconditions would not be binding on Israel anyway, it might be more expedient to just cut to the chase and launch the air strikes today.