"The P5+1 remains united on the subject of Iran. There is absolutely no divergence whatsoever in what we believe is necessary for Iran to prove that its nuclear program is going to be peaceful into the future," US Secretary of State John Kerry stressed on Saturday, ahead of a London meeting with UK Foreign Secretary Philip Hammond in London.
Deputy foreign ministers from the United States and Iran met to discuss the Iran nuclear issue on Friday. On Sunday, Kerry is expected to meet with Iran's Foreign Minister Javad Zarif in Geneva.
Western countries have accused Iran of developing nuclear weapons under the guise of a civilian program, claims that Tehran has repeatedly denied.
The UN Security Council, the United States, the European Union, and a number of other countries have imposed sanctions on Iran over its nuclear development, which Tehran insists is exclusively for peaceful purposes.
The P5+1 group, which includes China, Russia, the United States, the United Kingdom, France and Germany, has held several rounds of negotiations with Iran on the nuclear issue, with limited results.
In November 2013, Iran and the P5+1 group only managed to reach an interim agreement.
At November 2014 talks in Vienna, the negotiating parties again failed to work out a comprehensive deal, agreeing instead to extend the deadline for reaching an agreement to July 2015.
