Which of the European powers was not ready to fight a modern war?

In the lead-up to World War I, Austria-Hungary was one of the European powers that proved ill-prepared for modern warfare. Its military was characterized by outdated tactics and a lack of coordination among its diverse ethnic groups. Additionally, the empire faced significant internal strife and political fragmentation, which hindered its ability to mobilize effectively for a large-scale conflict. These factors contributed to its struggles during the war, highlighting its unpreparedness for the demands of modern combat.