Earlier quoted context omitted.
"The idea of a city split into two by ideologically opposing factions, and the split being marked by a big wall, sounds like sci-fi now." Current reality in Nicosia (capital of Cyprus, a EU nation). https://en.wikipedia.org/wiki/United_Nations_Buffer_Zone_in_... > "The Turkish army has built a barrier on the zone's northern side, consisting mainly of barbed-wire fencing, concrete wall segments, watchtowers, anti-tank…
Korea. While it's not in the middle of the capital, it's not that far. And the border is much tighter than the Berlin wall has ever been.
https://de.wikipedia.org/wiki/Selbstschussanlage
(I haven't found the matching article on the English Wikipedia, sorry)