Nato reunion will be very akward...if Turkey join, with this situation it's more probable that she will be neutral/american-leaning but outside official Nato, maybe CENTO till last, after who knows.
Yugoslavia will be not happy because an expansionist Greece will create turbulence in the Balkans. The more turbolence there is in the Balkans, the more trouble there will be in Yugoslavia, considering their internal problems (which did not disappear by magic under Tito: they were simply swiped under the carpet and as soon as Tito died erupted with a vengeance). Then who knows, if Greece is rabidly expansionist why Bulgaria should stay meek? And what about Albania?
Oh dear, not only we get internal terrorism, the oil crisis now the Balkan are again a trouble spot...stop the world i want get out.
anonymous french politician in 1973
More seriously, during the cold war thinking of change the border in Europe was a big, and i really mean big no no, as this can really create a situation where the two alliance stare at each others with weapon loaded and the trigger hitchin, so nobody in Europe (or in the rest of the world) will be very pleased