DUBAI, United Arab Emirates—A South Korean oil tanker held for months by Iran amid a dispute over billions of dollars seized by Seoul was freed and sailed away early Friday, just hours ahead of further talks between Tehran and world powers over its tattered nuclear deal. MarineTraffic.com data showed the MT Hankuk Chemi leaving Bandar Abbas in the early morning hours. South Korea’s Foreign Ministry said Iran released the tanker and its captain after seizing the vessel in January. The ministry says the Hankuk Chemi left an Iranian port at around 6 a.m. local time after completing an administrative process. Iran’s Foreign Ministry spokesman, Saeed Khatibzadeh, later confirmed that Iran had released the vessel. “At the request of the owner and the Korean government, the order to release the ship was issued by the prosecutor,” Khatibzadeh was quoted as saying by the state-run IRNA news agency. The ship’s owner, DM …