VIENNA — Secretary of State John Kerry held a series of meetings with US partners in the nuclear talks on Thursday before an evening negotiating round with the Iranians. Kerry was meeting British Foreign Secretary Philip Hammond in a Vienna hotel as world powers seek progress in the talks. He’ll later talk to chief European Union diplomat Federica Mogherini and Chinese Foreign Minister Wang Yi. Thursday evening will be dominated by Kerry’s scheduled session with Iranian Foreign Minister Mohammad Javad Zarif. .