Turkish President Recep Tayyip Erdogan today threatened Greece that "one night it will come suddenly".
Erdogan has previously used the phrase to hint at military operations in Syria and Iraq against Kurdish militants and has carried out the threat several times.
Speaking at an air technology fair in Samsun where Turkey unveiled a prototype unmanned fighter jet, Erdogan lashed out at neighboring Greece, with which political and military tensions are rising.
Turkey accused Greece of using Russian-made S-300 missile systems in Crete to target Turkish planes in August.
Ankara also said that Greek F-16s harassed Turkish planes by placing them under radar jamming during a NATO mission over the eastern Mediterranean.
Athens also accused Turkey of violating its airspace.
Although both NATO members, Turkey and Greece have decades-long disputes over several issues, including territorial claims in the Aegean Sea and disagreements over airspace there.
Turkey claims that Greece is violating international agreements by militarizing islands in the Aegean Sea.
"The occupation of the island does not hold us back. When the time comes, we will do what is necessary. As I say, one night we can come suddenly," Erdogan said today.
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