Cyprus is ready to engage in talks with Turkey to resolve differences but only "without blackmail and threats", President Nicos Anastasiades said on Wednesday.
The two countries are locked in a dispute over drilling rights in the Mediterranean, and Turkey said on Tuesday it had extended a drilling vessel's operations in disputed waters off Cyprus until October 12.
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"Nicosia has been always ready for a dialogue but for that ... to be effective, it needs to be clearly defined based on international law, without blackmails or threats," Anastasiades said after talks in Nicosia with European Council President Charles Michel, who chairs EU summits.
Anastasiades said Turkey's move to extend the Yavuz drilling ship's operations came at a time when the European Union, of which Cyprus is a member state, was taking a series of initiatives to try to reduce tensions.
EU leaders will look for a way to defuse tensions in the eastern Mediterranean when they hold a summit on September 24-25.
"In view of the EU Council meeting next week, we underscored the importance of staying united on the messages (to Turkey) and determined to implement our decisions if the illicit actions continue," Anastasiades said.
Speaking at an online panel on EU-Turkey relations, Turkish Deputy Foreign Minister Faruk Kaymakci said Turkey's operations in the eastern Mediterranean were in response to the "unilateral actions" by Greek Cypriots and Greece, and not an intimidation.
"This is not an intimidation, this is just to say that Turkey will continue to defend its own rights and also the rights of Turkish Cypriots, who were cheated by Greek Cypriots and the EU," Kaymakci said, referring to several failed efforts to unite the island of Cyprus.
In an interview with the Economist, Greece's Prime Minister Kyriakos Mitsotakis said on Wednesday that he was concerned by Turkey's move to extend the operation of its Yavuz energy drilling ship in disputed Mediterranean waters.
"Turkey has a choice - engage with Europe in a constructive way or continue its unilateral actions and face consequences," he said.
Cyprus' internationally recognized Greek Cypriot government has long been at loggerheads with Turkey, which began drilling for oil and gas near Cyprus last year.
The island was split after a 1974 Turkish invasion spurred by a brief coup engineered by the military then ruling Greece. A breakaway Turkish Cypriot state in north Cyprus is recognized only by Ankara.