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 ditches, and minefields. The zone cuts through the centre of Nicosia, separating the city into southern and northern sections. In total, it spans an area of 346 square kilometres (134 sq mi), varying in width from less than 20 metres (66 ft) to more than 7 kilometres (4.3 mi).[2][3][4] Because of this, after the fall of the Berlin Wall in 1989, Nicosia remains the last divided capital in Europe.[5][6]"