Can a Vauban-style fort anchor a modern city's air defence?

Could a Vauban-style star fort protect a modern city or town from air and missile threats?

Potentially. A hardened fort could provide immediate protection and buy time for mobile systems to deploy, while those mobile systems stay dispersed elsewhere.

A star fort would be large, visible, and vulnerable to attack. Its purpose would be to provide immediate protection while mobile defences deploy around the city. For a large city, two or three hardened sites could anchor that initial coverage. Mobile systems should remain dispersed elsewhere so a single strike cannot destroy both fixed and deployable layers. A hardened anti-ballistic-missile site is offered as another case in which fixed defences could make an attacker commit to a much larger war.