Not quite your premise, but Turkey either reduced to the European rump, losing 'Asia Minor' to the neighbours, SE border across isthmus near Izmit, or Turkey losing the European side, back to the NW edge of Istanbul, frontier along the rivers/lakes on isthmus...
Or both, Istanbul becoming a city-state like Singapore ??
FWIW, the Communist coup in Greece failed because they ran into elements of UK 'Eighth Army', the famous 'Desert Rats'.
Yes, the fighting in Athens was 'effin brutal', street by street, house by house, even room to room. My father was there, a Comms tech with a shot-out, musket-smooth rifle, teamed with a cold-eyed marksman from RAF Regiment.
Yell 'GRENATE !!', toss a German training grenade (Re-usable!!) into alley, insurgents scatter. Bang, marksman nails one, diminishes others' enthusiasm.
Bonus points for impassioned Commissars.
That tactic was called, 'Caught and Bowled'.
When defenders ran out of training grenades, a hurled wine-bottle with rag and yell of 'MOLOTOV !!' sufficed...
That, given its usual contents, was called, 'Taking the Pi$$'...
My father said his gun was so wonky, it really wasn't a rifle. Inaccurate beyond pistol range. A shame, as he was actually an excellent shot. He didn't think he hit any-one, unless by lucky ricochet, but he racked many 'Assists'...