The article explores modern trends in the development of the international security system in the context of the influence of military conflicts. It is proven that the intensification of uncertainty and tension in global confrontation affects the increase in military spending in countries worldwide. The features of acquiring international characteristics of modern conflicts are highlighted. Dynamic changes in contemporary military spending, factors influencing their dynamics are analysed. Regional peculiarities of shifts in the security environment and trends in military spending are identified. The correlation between the geopolitical interests of countries and the level of military spending are substantiated. The intensification of geo-economic and geopolitical confrontation in the world is analysed in the context of the rivalry between the USA and China – leaders among countries in terms of military spending. The Top 10 countries in the world and Ukraine are analysed by the level of military spending. It is determined that russia's war against Ukraine not only has catastrophic consequences for the European continent but also poses a real threat to the world order and security system. The impact of geopolitical asymmetries and modern global challenges on the escalation of conflicts in the world is proven. Characteristics of modern conflicts defining their asymmetry are identified in the article. The essence of hybrid warfare as a form of modern conflict that combines traditional and non-traditional (military and non-military) measures of purposeful and organized infliction of losses, destruction of the country's potential (economic, innovative, military, demographic, etc.) to achieve strategic goals by the aggressor country is determined. Keywords: conflict, military conflicts, terrorism, military spending, security, international security system, asymmetry, hybrid warfare.