The UN is not a military defense organisation la NATO. It has military efforts, but they are all Pacific in the sense that they don’t take part and only help the civilian population (e.g.: running medical and food supplies, or protecting hospitals, etc.)
The UN could go for economic and political sanctions, or try to move this in the Hague Courts in case the request goes unheard.
As per the article:
The only trip that I know of that takes less than 2.5 hs by train is Madrid-Barcelona and Madrid-Valencia . But Madrid is an international hub with connections to most of the international routes. So, my thinking is that this would not apply. It might only make sense for private flights, which are already very minor, AFAIK.
Again, smokescreen law, from smokescreen leftist party.