"The Turkish moves are illegal and represent a new dangerous escalation that reveals Turkey's destabilizing and threatening role," the Greek Foreign Ministryش said in a statement posted on its official Facebook page.
"Greece will not accept any blackmail. It will defend its sovereignty and its sovereign rights," she added.
The Turkish Navy issued a navigational notification saying that its ship, "Oruj Reis," would conduct seismic surveys in the eastern Mediterranean during the next two weeks.
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