“We continued to underscore that we hoped these talks result in an environment that is conducive to a sustained process that delivers results,” Clinton told reporters after a meeting of Group of Eight foreign ministers.

“This is a chance for Iran to credibly address the concerns of the international community,” she added. “Iran, in coming to the table, needs to demonstrate that they are serious,” the chief US diplomat said. “We are receiving signals that they are bringing ideas to the table,” Clinton said ahead of talks between Iran and the five permanent members of the UN Security Council plus Germany.

“We are looking for concrete results. And of course, in a negotiation, we understand that the Iranians will be asking for assurances or actions from us and we will certainly take those under consideration,” Clinton said.

“But I do think it is clear to everyone, certainly in the P5+1 but far beyond, that the diplomatic window for negotiations is open but will not remain open forever and therefore time is a matter to be taken into account,” she added.