Seoul, May 20 -- A South Korean oil tanker managed to traverse the Strait of Hormuz on Wednesday in a rare move, marking the first such successful passage by any South Korean vessel through the blocked waterway ever since the beginning of the Iran war.

"At this very moment, our oil tanker is passing through the Strait of Hormuz," said Foreign Minister Cho Hyun, in an address to lawmakers at the National Assembly in Seoul earlier.

"We completed consultations with the Iranian authorities, and the vessel began sailing yesterday, proceeding very cautiously," Hyun said, adding that the tanker was carrying "2 million barrels" of oil.

According to leading real-time ship-tracking, and maritime analytics site MarineTraffic, the Seoul-flagged tank...