Russia's 'shadow tanker fleet' and how it worksListen to this articleThe oil tanker detained by France is suspected of being part of Russia's shadow fleet, which uses flags of convenience and false flags to dodge sanctions. afpPARIS - France's interception of an oil tanker suspected of being part of Russia's "shadow fleet" draws attention to how the vessels allegedly operate in order to escape Western sanctions. - What is the 'shadow fleet'? -The United States, which is leading efforts to try to broker an end to the conflict in Ukraine, in early January stepped up its sanctions against Russia's oil industry, including the shadow fleet. The French navy on Thursday boarded an oil tanker in the Mediterranean suspected of belonging to Russia's shadow fleet.