that's right. I think the impact is even bigger than that. but the most important thing I think is the economy, especially in terms of food. in war food remains the main source of human energy. if there is a war of course its circulation will be very difficult. I think this is the main problem that is more serious than anything else from the war.
Wars put a stop to everything. Any advances in economic, technological and infrastructural development would be lost. A country having entered a full blown war with an equally formidable opponent would prioritize the need to crush their enemies and win the war than how the economy is faring. The sooner the war is over, the sooner growth and progress can again resume.
You would be really lucky if a country in an all out war manages to grow enough food to even consider circulating.
Food products normally imported would decrease to the barest minimum or even stopped as funds would be diverted to the war efforts. So I think ending the war would be more serious.
War is chaos, no matter who's involved in it. As long as they lose something—lives, food, oil, or any resources—there will be no winner. War is the only end point of a conversation in a country if they can't come up with an argument, but they are not thinking about their citizens, even their own country. No matter what war they do and how they defeat another country, they still can't be considered a winner as they still lose something. Not just food, but more valuable than that is human life. We don't know why some leaders of a country will engage in or result in this kind of event; what would they achieve from it, dominance? Power? All of that will be meaningless if they lose all they have, including the lives of their citizens. Instead of protecting their citizens by not engaging in a war, they still engage as part of their ego.