The 80 kilograms (176 pounds) of cocaine were found stashed in the frame of a freight container at the port of Piraeus, the Finance Ministry's fraud agency said.
Authorities in Greece, Croatia, Bosnia and Macedonia had been tracking the shipment for weeks, the agency said, estimating the drugs were worth some €3.6 million (US$5.3 million).
One suspect was arrested in Greece, while six others were arrested in Bosnia and Croatia.
The ship had originally been bound for Rijeka, Croatia, was but was diverted to Greece, police said.
Malaysia needs Russia's assistance in maintaining and repairing Su-30MKM fighter jets
Japanese Prime Minister Shinzo Abe said that US army bases will not appear on the southern Kuril Islands in the even Russia delivers them to Japan
Posters for the play "Adam and Eve. Life after Paradise" with pictures of dancers Arsen Aghamalyan and Oksana Vasilyeva were banned in the city of Tver, Central Russia