Imports of Iranian crude oil to South Korea were suspended in July as a result of EU sanctions, which cut off insurance for tankers carrying Iranian crude.

Yet data released Thursday showed
Seoul imported 4.259 million barrels of Iranian crude in July.

How so?

An official from state-run Korea National Oil Corp., which compiles monthly crude import figures from the country's four oil refiners including SK Energy and Hyundai Oilbank--the two importers of Iranian crude--attributed the import figure to belated customs procedures.

The monthly crude data is based on when oil shipments get customs clearance and all the volumes "appear to have been imported before July, " but kept in storage until they passed customs, the official said.

Officials at SK Shipping Co. and Hyundai Merchant Marine Co., the companies that had been bringing in Iranian crude shipments, confirmed that no ships carrying Iranian crude arrived in
South Korea in July.

An SK Innovation spokesman also said the data is "due to customs procedures," without elaborating. SK Innovation fully owns SK Energy.

Both SK Energy and Hyundai Oilbank, which relied on
Iran for 14.7% and 18.4%, respectively, of their crude needs during the first six months of this year, are expected to resume shipping Iranian crude in September using Iranian tankers.