Turkey said on Wednesday it had extended the stay of its Oruc Reis survey vessel and two other ships in a disputed area of the eastern Mediterranean until October 27, in a move likely to further escalate tensions in the region.

Two other vessels, the Ataman and Cengiz Han, along with Oruc Reis will continue working in an area southeast of the Greek island of Rhodes until October 27, Turkey's Navy said in a maritime notice. The vessels had previously been scheduled to work until October 22.

NATO members Turkey and Greece are at odds over conflicting claims to hydrocarbon resources in the eastern Mediterranean and overlapping views on the extent of their continental shelves. Tensions flared in August when Ankara sent Oruc Reis to waters also claimed by Greece and Cyprus.

Ankara had withdrawn Oruc Reis last month to "allow for diplomacy" before a European Union summit at which Cyprus sought sanctions against Turkey, but sent it back this month, prompting an angry rebuke from Greece, France and Germany.

After the summit, the bloc said it would punish Turkey if it continued its operations in the region, in a move Ankara said further strained Turkey-EU ties. Turkey says its operations are within its continental shelf.

In recent weeks the war of words between Turkey, Greece and Cyprus has escalated to shows of military strength, with military drills taking place in the region.

Earlier on Wednesday, Greece urged the EU to reconsider its customs union with Turkey in response to Ankara's exploration in the Mediterranean, deploring what it termed Turkey's "imperial fantasies."