ATHENS: Greece has advised Greek-flagged commercial ships to upgrade security measures when sailing in the Black Sea following a string of attacks on tankers over the past days, according to a shipping ministry advisory seen by Reuters. Greek-operated ships are among the world’s largest fleets of tankers and are pivotal for trade across the Black Sea region, whose waters are shared by Bulgaria, Georgia, Romania and Turkiye, as well as warring Russia and Ukraine, which Moscow invaded in February 2022.

Over the weekend, four Greek-linked tankers were reportedly struck in two of the world's most strategically important shipping corridors. According to

In recent months, 136 attacks on merchant vessels have taken place in the Black Sea