Washington has demonstrated beyond any doubt that its rift with Europe is irreversible, by deliberately choosing to go to war against Iran without consulting its European allies.
The prospect of strife in Iran in which groups are pitted against one another and forces emerge which weaken central authority will have grave consequences for the region.
Washington now faces choices: proceed with the deal and adjust its conception of alliances in the region or succumb to legislative stagnation and reject or downgrade the deal.