>without any checks Not necessarily true, any country can legitimately or not (there are some regulations on this practice, often breached) force them, for mer

>without any checks Not necessarily true, any country can legitimately or not (there are some regulations on this practice, often breached) force them, for mere political shows of force too, here's one recent such example. https://www.euronews.com/travel/2022/11/17/france-italy-border-tightened-as-france-warns-of-serious-passport-checks-and-queues https://www.euronews.com/travel/2022/11/17/france-italy-bord...