A Swiss Soldier In Ukraine

Why would a god-fearing Swiss citizen go against the laws of his own country to fight for Ukraine? Why does he disagree with his own country? Could the EU and NATO do more for Ukraine? What do you think? And is Russia really as bad as often depicted? Or do people exaggerate? Besides that, how is the everyday life of a soldier in a country at war? Is the life of such a soldier really filled with as...