Not my business to answer for Turks, but
- that map is wrong: Imbros/Gökçeada on the top right is Turkish.
- The South China Sea islands are uninhabited; the Greek islands are full of ethnic Greeks. Just as with the Falklands, who lives there is slightly more important than geographical location.
- We had a war, a mass population exchange, and a couple of treaties to deal with this. (And I get the impression that most of the ethnic Greek population of Imbros, who were meant to remain in place, have ended up in Australia.)