(Lausanne Switzerland) — Eyes bleary from lack of sleep, senior diplomats from the six countries negotiating with Iran huddled Thursday in a morning strategy session meant to advance the pace of agonizingly slow nuclear talks. Iran’s foreign minister said the sides were close to a preliminary agreement, but not yet there. The talks resumed several hours after a flurry of marathon overnight sessions between Secretary of State John Kerry and Iranian Foreign Minister Mohammad Javad Zarif, as well as other meetings among the six powers negotiating to curb Iranian nuclear programs that could be used to make weapons.