The war in Ukraine has become one of the most significant conflicts of the 21st century, with far-reaching impacts on global stability. This conflict began in 2014 after the annexation of Crimea by Russia and has developed into a large-scale war involving many parties. The implications are not only limited to Europe but also impact international relations, economics and global security. One of the main impacts of this war was increased tensions between Russia and Western countries. NATO, as a military alliance, is increasing its presence in Eastern Europe to provide support to potentially threatened countries. This addition of troops and military equipment creates an atmosphere of distrust that can trigger further conflict. On the economic side, the war in Ukraine contributed to instability in world energy prices. Ukraine, a major transit route for Russian gas to Europe, is facing significant supply disruptions. European countries dependent on Russian gas are forced to look for alternatives, accelerating the transition to renewable energy sources. However, continued dependence may ensure uncertainty in global energy prices. Globalization has also been affected by these conflicts, as many countries seek to reevaluate trade relationships and strategic alliances. Economic sanctions imposed by Western countries against Russia triggered a Russian response that targeted exports and created trade barriers. This adds to the challenges for global supply chains already disrupted by the COVID-19 pandemic. In the context of global diplomacy, the war in Ukraine allows non-Western powers, such as China, to increase their influence. China takes an official neutral position but has increasingly appeared to support Russia, both in economic and political relations. This raises concerns about the formation of new alliances that could shift the global balance of power. In addition, this war encouraged countries to increase investment in defense. European countries are committed to increasing military spending, which could result in a new arms race. On the other hand, countries not directly involved in the conflict should consider how they navigate between relations with Russia and the need to collaborate with Western alliances. The humanitarian crisis resulting from this war also creates challenges for global stability. Millions of Ukrainian refugees sought refuge in European countries, influencing immigration and social policies in many countries. The response to refugees has also tested solidarity between EU countries, generating internal tensions. At the environmental level, military conflict can result in widespread ecosystem damage. Fighting in resource-rich areas can cause severe environmental pollution, which can have long-term effects on public health and future economic stability. The war in Ukraine shows the complexity of international relations and its implications for global stability. From military tensions to economic and social impacts, uncertainty will continue to fill the current geopolitical landscape. Great power competition, humanitarian crises and environmental challenges are the main highlights that cannot be ignored. All of these factors create a context in which global stability is increasingly difficult to achieve, and the need for future diplomacy and cooperation is more urgent than ever.