Greece has issued a formal diplomatic complaint to Ukraine over the uncrewed sea drone filled with explosives that was discovered this month on a rocky shore in western Greece, the Foreign Ministry has said.

Ministry spokesperson Lana Zochiou made the announcement about the demarche to Kyiv during a press briefing Wednesday.

As Kathimerini reported last week, Foreign Minister George Gerapetritis had briefed the European Union’s top diplomat, Kaja Kallas, on the Greek military’s conclusions on the drone. He also discussed the issue with Ukraine’s top diplomat, Andrii Sybiha, at Thursday’s informal meeting of EU foreign ministers in Limassol, Cyprus.

The drone was discovered May 7 by fishermen on the Ionian Sea island of Lefkada and handed over to the military.

It is believed to be connected to a series of maritime drone attacks Ukraine is believed to have carried out in recent months targeting vessels linked to Russia’s efforts to transport oil.