The dynamics of the war in Ukraine have brought significant changes to the global security order. Since the conflict began in 2014, the consequences of the war have extended far beyond its geographic boundaries. One of the most striking impacts was the increase in tensions between NATO and Russia, which caused NATO member countries to strengthen their defenses in Eastern Europe. This created a strict atmosphere and encouraged massive arms purchases. This tension also affects the foreign policies of major countries. The US and its allies have increased their support for Ukraine, pouring in significant military aid and expanding economic sanctions against Russia. These sanctions not only target Russian individuals and entities, but also cover the energy and financial sectors, which have an impact on the global economy. The economic impact of the war is also visible in energy prices. Europe is heavily dependent on Russian natural gas, and this conflict triggered a spike in energy prices that disrupted the economic stability of European countries. This causes high inflation rates and has the potential to trigger a recession in several countries. Dependence on renewable energy is increasingly becoming an important agenda to reduce dependence on Russia. On the other hand, this situation creates opportunities for other countries, such as the United States, to increase their share of the energy market in Europe. US sales of LNG are increasing, which is also linked to climate change. Green energy policies that shift focus away from fossil fuels are becoming more important amidst energy supply uncertainty. Additionally, the war in Ukraine shows the importance of international alliances. Countries such as Japan and Australia are starting to take more active steps in strengthening their defense cooperation with Western countries. This highlights the understanding that security threats can be transnational, encouraging closer collaboration among countries that previously lacked significant military cooperation. The dynamics of this war are also changing people’s perceptions of cyber security. Increasingly intensive cyber attacks, whether triggered by the conflict in Ukraine or taking place simultaneously, show that security is now not only focused on physical aspects. Countries recognize that their critical systems must be protected from digital attacks that can cause serious damage. In a global context, the situation in Ukraine shows the vulnerability of the existing international system. This war tested international norms, including state sovereignty, the principle of non-intervention, and humanitarian law. The global response to this conflict could influence the way countries interact in the future, potentially creating new norms in international relations. The war in Ukraine has been called a turning point for many countries in redefining their defense strategies and foreign policies. Many countries are now preparing to adapt to a new reality, where tensions between great powers are becoming increasingly evident. This reflects the urgent need to build a more inclusive and sustainable security system to face future challenges.