Iran has sent some 16 million barrels of oil to Syria in violation of sanctions over the last six months, the Haaretz daily reports.
The report, based on an analysis of satellite photos, shows Iranian tankers docking at Latakia port 17 times during that period.
The report values the oil at more than $1 billion.
The deliveries violate both US oil sanctions on Iran and sanctions on the regime of Syrian dictator Basher Assad.
Haaretz says the deliveries are done by “ghost ships” that sail without proper identification.