Turkey makes new Greece threat ahead of military drill
"As Turkey and the Turkish people we are ready for every possibility and every consequence," Erdogan said in a televised speech in Istanbul.
Turkish defence officials said they would start five days of military exercises on Sunday in the breakaway republic of northern Cyprus -- an entity recognised only by Ankara.
NATO said this week Greek and Turkish leaders had agreed to take part in technical talks to avoid accidents between their navies.
But Erdogan made it clear that he would not compromise, saying: "Turkey is ready for any kind of sharing (of energy resources) as long as it is fair."
Turkey on August 10 deployed the Oruc Reis research vessel and an escorting flotilla of warships to the waters between Cyprus and the Greek islands of Kastellorizo and Crete.
The vessel's stay in the contested waters has been extended three times.