Iran nuclear accord is that big a deal

IN A dramatic breakthrough, Iran and the P5+1 - the United States, China, Russia, France, United Kingdom and Germany - on Tuesday reached a final, comprehensive deal to curb Teheran's nuclear programme while gradually easing international sanctions. Despite criticism of it, the deal is a major historic landmark that could have profound geopolitical and economic consequences in the Middle East and beyond.

The importance, complexity and tough nature of the entire 18-month talks process is underlined by the fact that John Kerry stayed for almost three weeks in Vien…