But there 's no guarantee that the two sides will be able to overcome their differences around the negotiating table . Negotiators for Iran and six world powers resume nuclear talks in Vienna , Austria . The U.S. has said it will not accept a deal that doesn't include curbs on Iran's atomic program. An interim deal is due to expire in less than three weeks . U.S. secretary of state urges Iran 's leaders to back up words with concrete actions .
Negotiators for Iran and six world powers resume nuclear talks in Vienna , Austria . The U.S. has said it will not accept a deal that doesn't include curbs on Iran's atomic program. An interim deal is due to expire in less than three weeks . U.S. secretary of state urges Iran 's leaders to back up words with concrete actions .