The League of Nations did not disintegrate overnight. It decayed as major powers abandoned collective security and returned to the raw calculus of coercion. The United Nations, built in 1945 to correct that failure, appeared more resilient. It survived ideological confrontation during the Cold War, enabled decolonization, and furnished global governance with humanitarian and development institutions. Yet today, the UN faces a crisis that is neither circumstantial nor bureaucratic. It is existential.
Former U.S. President Donald Trump’s revival of “America First” nationalism, and his rhetorical proposal for a so-called “Board of Peace,” are not eccentric departures from global diplomacy; they symbolize a deeper retreat from multilateralism. Trump’s view privileges sovereign discretion and transactional bargaining over institutional constraint. Under such a worldview, universal bodies like the UN are not instruments of influence, but impediments to national autonomy. This reversal matters because the UN has always depended on American endorsement as much as on its Charter.
The pressure on the UN does not emanate from Washington alone. Russia’s revisionism in Eastern Europe and China’s construction of parallel institutions across the Global South reflect a broader return to the doctrine of “might is right.” Great-power behavior is once again shaped by unilateral coercion, spheres of influence, and force-backed diplomacy—three forces that openly contradict the normative foundations of the UN Charter. When the major powers no longer accept institutional constraint, universal institutions become ornamental.
International relations theory anticipated this trajectory. Hegemonic stability theory argues that global order requires a dominant power willing to underwrite collective security. For most of the post-1945 era, the United States served that role. Under America First, Washington questions whether leadership should be a public good or a tradable asset. From a realist perspective, such recalibration is unsurprising; strong states employ institutions only when those institutions amplify power. Trump’s aspirational Board of Peace resembles the Concert of Europe more than the United Nations: small, selective, rapid, and unconcerned with universal legitimacy.
Yet the crisis is not merely theoretical. It is empirical. The past three decades reveal a pattern of institutional avoidance in which the UN either evades or is sidelined from the world’s most consequential conflicts. When the United States invaded Iraq in 2003 without UN authorization; when Russia intervened in Georgia in 2008, annexed Crimea in 2014, and launched a full-scale war against Ukraine in 2022; when China militarized the South China Sea and ignored tribunal rulings; and when India and China engaged in border crises in the Himalayas—the UN watched but did not act. In each case, great-power interests paralyzed or bypassed collective security.
Avoidance extends beyond major powers. The Syrian civil war became the most veto-stricken conflict of the century, immobilizing the Security Council and shifting diplomatic resolution to the Astana process led by Russia, Turkey, and Iran. The Israel–Palestine conflict, including recent Gaza escalations, remains shielded by repeated U.S. vetoes. The catastrophic Yemen war unfolded largely outside UN enforcement, mediated instead through regional diplomacy. Ethiopia’s Tigray conflict, Myanmar’s military coup, and various crises in the Sahel illustrate the same pattern: Security Council paralysis, sovereignty invoked as firewall, and regional actors assuming responsibility.
Even atrocity crimes have not triggered consistent UN enforcement. Rwanda in 1994, Srebrenica in 1995, Kosovo in 1999, Darfur in the 2000s, and the Rohingya crisis in Myanmar show how humanitarian norms collapse when coercive action threatens great-power equities. In such contexts, the UN’s mandates contract to humanitarian relief and high diplomacy while security governance migrates elsewhere.
These cases are not anomalies; they are data points in an institutional trajectory. They demonstrate how the UN has transitioned from collective security guarantor to functional coordinator. Humanitarian, developmental, and regulatory agencies—WHO, UNHCR, UNICEF, WFP, and ILO—continue to perform indispensable tasks. Neofunctionalist theory explains this resilience: technical cooperation persists even as security institutions fail. What risks extinction is not the UN’s bureaucratic capacity, but its Charter-based claim to shape the use of force and maintain peace.
The decisive variable remains the United States. The League failed because America never joined. The UN could falter because America no longer wishes to lead. Europe cannot replace U.S. power; China and Russia promote sovereigntist orders incompatible with universal norms; and the Global South possesses diplomatic voice but not enforcement leverage. Without a hegemon—or at minimum a committed coalition—the architecture of collective security cannot function.
Trump’s nationalist turn does not guarantee the UN’s demise, but it accelerates the transition from universal multilateralism to club diplomacy and transactional coalitions. The world does not move toward anarchy; it moves toward negotiated hierarchies in which rules are set by the few and tolerated by the many. The irony is historical: the League died from irrelevance before it died from war. The UN today occupies a similar liminal space—formally intact, operationally constrained, and philosophically questioned.
Whether it becomes a zombie institution or adapts to a multipolar world will depend not on its Charter, but on the willingness of major powers to be governed by rules they cannot always control. For now, that willingness is in retreat, and the post-1945 settlement that once made the UN indispensable is visibly unraveling.