The European Union on Sunday expressed concern after Turkey resumed its search for oil and gas in the eastern Mediterranean.
Ankara's "latest naval mobilizations in the eastern Mediterranean will lead to a greater antagonism and distrust," French news agency AFP quoted EU foreign policy chief Josep Borrell as saying.
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The latest development is "extremely worrying" he said, adding, "Maritime boundaries must be defined through dialogue and negotiations, not through unilateral actions and mobilization of naval forces," Borrell said in a statement.
The discovery of vast gas reserves in the region in recent years has sparked a prospecting scramble by Greece, Turkey and Egypt as well as Cyprus and Israel.
Turkish President Recep Tayyip Erdogan announced Ankara's resumption of operations on Friday, accusing archfoe Greece of failing to keep its promises.
His comments came a day after Athens and Cairo signed an agreement to set up an exclusive economic zone in the region.
On Sunday, Borrell said that "disputes must be solved in accordance with international law," adding that Brussels was "committed to help solving such disputes and disagreements in this area of vital security interest. The present course of action will not serve the interests either of the European Union or of Turkey. We have to work together for the security in the Mediterranean."
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The deal between Greece and Egypt aimed to establish maritime boundaries between the two countries and appeared to be a direct response to a similar accord reached last November between Turkey and the UN-recognized government in Libya, AFP reported.
The agreement considerably enlarged Turkey's maritime territory and drew accusations from several countries, led by Greece, that Ankara was trying to assert its dominance in the region.
i24NEWS contributed to this report
