World-power foreign ministers were due Sunday to make a final push to get Iran to agree to curtail its nuclear programme days before a looming deadline to agree the outlines of a deal. "We're moving forward," Iranian foreign Minister Mohammad Javad Zarif, hunkered down with US Secretary of State John Kerry in Switzerland since Thursday, told reporters. German foreign Minister Frank-Walter Steinmeier, who like French counterpart Laurent Fabius joined the negotiations on Saturday, said the talks were in the "endgame". Russia's chief negotiator, Sergei Ryabkov was quoted by the RIA **vosti news agency as saying the chances of a deal were "more than 50/50".