Tags: Laurent Fabius

It was an agreement born from a fear of failure, delivered by the smoothness of French diplomacy. Six years earlier, countries had bitterly walked away from global climate talks in Copenhagen without a deal.

France's Foreign Minister Laurent Fabius said on Sunday it was unclear whether an international deal could be reached on Iran's nuclear program by a June 30 deadline.

With a deadline hours away, Iran and six world powers ramped up the pace on Tuesday in negotiations over a preliminary deal on Tehran's nuclear program, while officials cautioned that any agreement would likely be fragile and incomplete.