Everything is related with each other.Country like America,Russia they heavily rely on their weapon industry.To support their weapon industry they need more war all around the globe.The influential people from weapon industry is convincing every one they need.The more war happens their sells goes up.Now what can be done?If those country stop depending on arms selling to different areas,that is the only thing can happen.But president like trump is surely not going to do that.@upvoted