Wars doesnt harm every country. i think some of the country gets benefited because of it.
If you are talking in terms of power and money, you may be right, but in terms of ethics and human rights I don't think it benefits anyone.
War only benefited the industries that were responsible for global arms production. I am of the opinion that they have a big say in the war, and they might even lobby for a war in a particular region because, for them, war means business. Just take the example of the Russia-Ukraine war and the ammunition provided to both countries. These arms dealers are getting rich at the expense of human lives.
And, as we've seen with Covid-19, globalization has broken the natural boundaries that always existed between countries/continents, so nowadays any war impacts every country in some degree. I don't know where you live, but chances are that you have witnessed it yourself the last time you went to a supermarket.
The war can only impact the World if it is between the two major countries. Wars are going on in Africa frequently, but they are not impacting the global economy; on the other hand, the war between Russia and Ukraine did impact every nation and the global economy.