The article in the url below focuses on the "phantom fleet" of ships with dubious ownership that the U.S. reports are shipping "illicit oil" around the world. Due to sanctions on the trade of this oil, since early December the U.S. has seized ten of these ships, while India has seized three and France another one. Unfortunately, those 14 ships do not put much of a dent in the scale of this problem for the global oil industry:
"The phantom fleet of sanctioned vessels now numbers 1,300 ships, according to TankerTrackers.com, a ship-tracking website. ... Many are clustered on routes from Russia and Iran headed to buyers in Asia."
While more than a quarter of the ships have turned off their transponder beacons (to hide their locations), the majority can still be identified and tracked:
"Shadow fleet ships, usually old, sailing under false flags and sanctioned, accounted for 6% to 7% of the global crude oil flows in 2025, according to ship-data firm Kpler. Russia last year relied on the fleet to transport around 80% of its crude and oil products, analysts estimated."
Of particular interest, the article contains a map showing where all these ships are located, as of February 10. I find this interesting because the red dots clearly delineate the major shipping routes across the globe, highlight how daunting it is for the U.S. to try and police this illegal trade, as well as how fossil fuels remain the driver of such massive amounts of human activity: