South Korea's oil imports from Iran fell nearly 38 percent in April from the month before as Tehran struggled to maintain supply after clearing crude stored on ships.
South Korea, one of Iran's main Asian customers, imported 344,933 bpd of Iranian crude in April, customs data showed on Monday. That was down 37.5% from March, but still up 63.5% from a year earlier.
South Korea, the world's fifth-largest crude importer, brought in about 433,659 bpd, of crude from Iran in the first four months of the year, up 86% from a year ago.
South Korea's crude imports from Saudi Arabia in April fell 15.1% to 859,127 bpd, from a year ago.
Overall, South Korea's crude oil imports in April fell 5.6% to 2.76 million bpd, from a year earlier, the data showed.
Final data for April crude oil imports will be released by state-run Korea National Oil Corp (KNOC) later this month.