ABCDEFG SEOUL, April 11 (Yonhap) -- South Korean Prime Minister Chung Sye-kyun departed for Iran on Sunday for bilateral talks amid lingering tension over Tehran's call to unlock its funds frozen here under U.S. sanctions. During his three-day visit that ends Tuesday, Chung is expected to discuss ways to enhance the Seoul-Tehran relations and other matters. The visit marks the first such trip by a South Korean premier in 44 years. The visit came two days after the Iranian government released a Korean oil tanker and its captain who were detained over alleged oil pollution. The detainment was widely seen as Teheran's retaliation against South Korea's seizure of some US$7 billion Iranian funds in early January, related to the U.S. nuclear sanctions on Iran.