Earlier quoted context omitted.
Different countries ... with a common heritage.
Maybe during history lessons you preferred a good beauty sleep instead of paying attention to the class :)
Over a million "Greeks" were deported to Greece in the 1920s, despite many speaking only Turkish and many "Turks" were sent back the other way. Not to mention that most of those inhabiting Turkey today - and identifying as Turks - have an awful lot of non-Turkish ancestry. It's not only Greek of course (plenty of Armenian, Kurdish, Arab, Albanian, Circassian, Bulgarian, etc), but Greeks and Greek culture has had a massive imprint on modern Turkey - and Turks have also had an impact on modern Greek culture.
Of course neither side is particularly happy to admit it, but it's very much there.