Greek Prime Minister Kyriakos Mitsotakis on Wednesday urged Turkey to show “sense” in a naval showdown in the Eastern Mediterranean over energy exploration which he warned could lead to a military accident.

Tensions were stoked Monday when Ankara dispatched the research ship Oruc Reis accompanied by Turkish naval vessels off the Greek island of Kastellorizo in the eastern Mediterranean.

Greece also deployed warships to monitor the vessel, which is currently sailing west of Cyprus.