The Greeks detained the tanker under European Union sanctions. ATHENS. Greek authorities have detained a Russian tanker in the Aegean Sea as part of European Union sanctions against Russia. Greece reported on Tuesday, the AP reported. The Greek Coast Guard said an oil tanker with 19 Russian crew members on board, flying the Russian flag, was detained on April 15 and is currently moored in Karystos Bay on the south coast of Euboya. (Evia). The Coast Guard added that the detention order concerned the ship itself and not its cargo. The article continues under video advertising. government of President Vladimir Putin. Among the sanctions is a ban on the import and export of large quantities of goods, as well as a ban on the entry of Russian-flagged ships into EU ports.