Iran and major powers will seek Monday to put the finishing touches to a historic nuclear deal, with both sides saying an accord ending a 13-year standoff lies tantalisingly within reach. There had been optimism that a deal would be clinched over the weekend, but finalising a framework accord struck in April had proved difficult, with talks stumbling on the exact timing of sanctions relief and Iran’s desire to have a UN conventional arms embargo lifted. “We have come a long way. We need to reach a peak and we’re very close,” President Hassan Rouhani said in Iran Sunday. “We are so close that if you look down from below you feel as if we have got there, but when you do get there you know there are still some steps to take.” Foreign ministers from the P5+1 of the United States, Britain, France, Germany, Russia and China were expected to be present in Vienna on Monday. “I hope we are finally entering the final phase of these marathon negotiations. I believe it,” French Foreign Minister Lauren Fabius said on Sunday. On Monday, the terms of a 2013 interim deal freezing parts of Iran’s nuclear programme in return for minor sanctions relief expire, although this has been extended several times already.