South Korea did not import any crude oil from Iran in April, according to preliminary data released Friday by Korea Customs Service.
The world's fifth-largest crude buyer imported a total of 8.5 million tonnes of crude last month, down from 11 million tonnes a year earlier.
South Korea also imported no Iranian crude oil during the same period last year.
Final data for South Korea's crude oil imports for April will be published later this month by state-run Korea National Oil Corp (KNOC). The KNOC data is considered the industry standard for South Korea's oil imports.