There’s more to this story than just some Greeks shipping oil for Russia. Apparently Russia has been engaged in shipping Ukranian wheat via ‘dark shipping’ for a while now. Some Greek shipping magnates believe the sanctions on Russia are ‘bullshit’. With that belief, they feel little concern for making them work. Since Greek shipping moves a large amount of oil, this is a problem for the EU and for people who support Ukraine.
In dark shipping, ships turn off their AIS tracking when they are near ports where suspect cargo can be loaded. While draft upon entering and leaving can be observed, you can’t tell what’s been loaded or unloaded by the location where they docked. It’s an ideal way to transport forbidden materials without actually opting out of the universal tracking system.
All’s fair in war. And business is war. There’s no love here.

Sam Chambers July 6, 2022
Zelenskyy urges Greek owners to stop moving Russian oil – Splash247
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