TOPSHOTS Iranian Foreign Minister Mohammad Javad Zarif jokes with reporters on January 14, 2015 before meeting with the US state secretary in Geneva. Zarif said on January 14 that his meeting with US counterpart John Kerry was vital for progress on talks on Tehran's contested nuclear drive. Under an interim deal agreed in November 2013, Iran's stock of fissile material has been diluted from 20 percent enriched uranium to five percent, in exchange for limited sanctions relief. AFP PHOTO / POOL / RICK WILKING