Experts say covert transfers at sea are used to obscure the origins of oil that left Iranian ports and the Gulf of Oman before the blockade was imposed.

Sanctioned tankers are allegedly disguising Iranian oil shipments as Iraqi cargo while Trump doubles down on the naval blockade to squeeze Tehran.

STOCKHOLM (AP) — Sweden is investigating a tanker that is suspected of being part of the sanctioned Russian “shadow fleet,” according to the Scandinavian country’s civil defense minister. The Swedish Coast Guard said it boarded and detained the Jin Hui on Sunday on suspicion of flying a false flag while transiting Swedish waters.

Ukraine has launched a wave of strikes against Russia's oil export infrastructure, including tankers in its "shadow fleet."