Nuclear talks between Iran and six major powers have ended in Geneva with nothing more than an agreement to hold more talks next month.After two days of talks – the first in more than a year – the only agreement that has been reached is to reconvene next month for more talks in Turkey. But even then, Iran says it will not be discussing any halt to its nuclear enrichment program.It is a stark illustration of how much work is still to be done to reach an agreement on opening up Iran's nuclear program to international inspectors.Iran says talks will progress if international sanctions are lifted, but major powers like the US, China, Germany and Britain would prefer to see it the other way around.