Explainer: How Iranian oil link could complicate insurance claims after tankers collide off Singapore

"Ceres I last loaded Iranian oil via transfer with an Iranian tanker in March off the country's Kharg terminal, subsequently transferring the cargo to two tankers around the Malacca Strait between April 7-9, said Claire Jungman, chief of staff at advocacy group United Against Nuclear Iran, which tracks Iran-related tanker traffic via satellite data. That cargo reached China on May 29, Jungman said. Ceres I loaded Iranian oil at least four times since 2019, transporting 8 million barrels, according to analysis by Jungman. The vessel also made four trips carrying Venezuelan oil between 2021 and 2023 totalling 7.5 million barrels, she said."