Washington remains "determined to make certain" Iran does not acquire a nuclear weapon, said US Secretary of State John Kerry.
Kerry told the press following a three-day talk between the permanent members of the UN Security Council and Germany, also known as P5+1 countries, and Iran over Tehran's nuclear program that "there is no question in my mind that we are closer now."
"As we leave Geneva with good work and faith we can in fact secure our goal," he said. "Over the past two days, significant amount of progress was made... There is a unity in our position and a unity in our purpose."
He said it took time to build confidence between countries that have really been at odds with each other for a long time and added "We are working hard to try to overcome mistrust...to try to find the ways that both the P5+1 and Iran have the ability to be able to achieve this goal."
Diplomacy takes time he said and expressed optimism that a deal would be reached in the coming weeks.
But he also said that the window for a diplomatic solution would not be open "indefinitely".
The international powers are concerned that Iran is trying to build a nuclear weapon but Iran says its program is peaceful.
Geneva talks on Tehran's nuclear program will continue on November 20th, said European Union Foreign Policy Chief Catherine Ashton in a joint press conference with Iran's Minister of Foreign Affairs Mohammad Javad Zarif.
Reading a joint statement with Zarif, Ashton said that there is a concrete progress despite existing differences, after extensive meetings.
"Both sides work on negotiations, hope to have a deal soon," said Iran's Minister of Foreign Affairs Zarif, underlining different opinions of six countries which participated in Geneva talks.
Zarif said that he urges France's Minister of Foreign Affairs Laurent Fabius and other ministers to have a deal on negotiations and support the process, stressing the important role of France in P5+1 countries.
"Iran's expectations from other contries are decisiveness and political will in Geneva talks," said Zarif, noting that existing different opinions are normal, in response to a question on France's political position.
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