The Black Hawk helicopter landed after sending a distress signal to authorities at the airport in Alexandroupolis in the country's north.
Seven of those on board were in military uniform and all are believed to have been involved in the attempted putsch, ERT TV said.
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"We have requested Greece to extradite the eight traitors as soon possible," Cavusoglu was quoted as telling HaberTurk television.
According to an official in the Greek National Defence General Staff, "the helicopter is scheduled to be sent back immediately to Turkey".
Greek Prime Minister Alexis Tsipras on early Saturday expressed his "support for the democratically elected" Turkish government.
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