Greek authorities have arrested a Turkish man after discovering a major weapons cache on his drifting vessel near the northern port of Alexandroupolis.

Increased volcanic activity in Greece’s famed tourist hotspot of Santorini has prompted the country’s civil protection minister to call a meeting with local and disaster response officials.

The crisis over Ιmia, a pair of small uninhabited islets in the Aegean Sea, in January 1996 led Greece and Turkey to the brink of war.

A dispute between two captains from Greece and Turkey escalated into a major international incident, the Imia Crisis, that ...