The race to succeed António Guterres as Secretary-General of the United Nations is unfolding against a backdrop that the organization was not designed to manage. Eight decades after its founding, the UN faces a world in which geopolitical rivalry is inseparable from geoeconomic competition, in which economic coercion has become a standard instrument of statecraft, and in which multilateral institutions are under sustained pressure from both major powers and increasingly assertive middle powers.
The next Secretary-General will inherit an institution weighed down by recurrent crises, financial constraints, and a growing doubt about whether the UN can still deliver the collective action it was created to enable. The challenge is not only to administer the organization. It is to renew it.
The world the UN was created to manage was defined primarily by the balance of power among great states. The postwar order sought to contain rivalry, manage decolonization, and provide a forum for collective security. For much of the Cold War, the UN’s role was constrained by the superpower divide, but its legitimacy derived from the fact that it reflected the world’s fundamental geopolitical architecture.
Since the end of the Cold War, the international system has been reconfigured in ways that the UN’s founders did not foresee. The 1990s brief promise of a liberal order, in which markets, democracy, and multilateralism would expand in tandem, gave way over time to a more contested and fragmented system. The 2008 financial crisis, the rise of China, the 2014 annexation of Crimea, the 2018–2020 trade and technology conflicts, the pandemic, and the wars in Ukraine and Gaza have all accelerated the erosion of that order.
The most consequential shift is not simply that geopolitics has returned. It is that the world is now organized less by a clear balance of military power than by an increasingly fragmented geoeconomic order. Wars span continents, but the contests that shape them are often fought through supply chains, debt, sanctions, investment screening, technology restrictions, trade barriers, energy security, and access to critical minerals. Economic power is now exercised as much through markets, financial systems, and institutions as through military force.
That transformation has fundamentally altered the role of diplomacy. Diplomacy is no longer primarily about managing relations between sovereign states within a stable framework. It is about navigating economic interdependence that is simultaneously a source of growth and a source of vulnerability. It is about mediating disputes where economic and security interests are inseparable. It is about building consensus on issues that require both political arbitration and technical economic coordination.
For much of its history, the UN has looked to diplomats, statesmen, and political mediators to lead the organization. Those qualities remain essential. But they are no longer sufficient. The defining contests of the twenty-first century are not fought only through armies and alliances. They are shaped through supply chains, debt, technology, trade, investment, sanctions, energy security, and access to critical minerals. Power is now exercised as much through economic networks as through military force. Yet the criteria for selecting the world’s highest international diplomat have been slow to reflect that transformation.
The next Secretary-General should not merely be a guardian of multilateralism. He or she must be an architect of cooperation in an era defined by fragmentation. That requires more than experience in diplomacy alone. It requires the ability to understand how economics, development, finance, and security now intersect in practical and politically consequential ways.
This is not a call for technocratic leadership. Nor is it an argument that economics should displace diplomacy. It is a recognition that diplomacy itself has changed. The Secretary-General of tomorrow will be required to navigate sovereign debt crises, broker consensus on climate finance, engage with development banks, understand technological competition, and mediate disputes in which economics and security are inseparable. The office has traditionally rewarded political experience. The coming decade will require economic fluency alongside diplomatic skill.
The question facing member states is therefore not simply who should succeed António Guterres. It is what kind of leader the world now requires. That answer points toward a profile long underweighted in discussions of UN leadership: a figure equally comfortable in cabinet rooms, development institutions, financial negotiations, and diplomatic forums.
Someone who understands not only the language of peace and security, but also the mechanics of growth, development, and economic resilience.
In this regard, the discussion surrounding Rebecca Grynspan is instructive. Her significance lies not only in her personal qualifications, but in what her career represents. As a former Vice President of Costa Rica and current Secretary-General of UNCTAD, she embodies a model of leadership shaped by the evolving demands of global governance.
Her experience spans development economics, international finance, diplomacy, and multilateral negotiation—areas now central to the effectiveness of the United Nations itself.
Some may argue that the UN’s core mission remains peace and security, and that economic issues should be handled by specialized institutions. That view is increasingly outdated. In Ukraine, in Gaza, in the Sahel, and in the Democratic Republic of the Congo, the drivers of conflict are no longer separable from economic pressures, debt, resource competition, and the effects of sanctions and food insecurity. The UN cannot be effective in its traditional areas if it ignores the economic dimensions of those crises.
The case for leaders of this kind extends beyond any individual candidacy. The United Nations was created in the aftermath of the Second World War to preserve peace, foster cooperation, and provide a framework for collective action. Eight decades later, it confronts a fundamentally different environment: one defined by geopolitical rivalry, geoeconomic competition, technological disruption, widening inequality between nations, and mounting pressure on global systems of stability.
These pressures are reinforced by shifting patterns of major-power engagement with multilateral institutions, including periodic questioning of commitments by key member states and intensifying debates over burden-sharing, institutional efficiency, and reform. At the same time, the United Nations faces an internal imperative of adaptation. An institution designed in the aftermath of 1945 cannot rely on inherited structures and assumptions if it is to remain effective in the twenty-first century. It must modernize its processes, improve cost-effectiveness, and strengthen responsiveness to a rapidly changing global environment, looking outward to a more fragmented order while also reforming inward to preserve legitimacy and performance.
Nowhere is this shift more visible than in the widening divide between the Global North and the Global South. Trust has eroded. Developing countries increasingly question whether international institutions reflect their interests, priorities, and lived realities. At the same time, developed economies struggle to sustain consensus on climate finance, development assistance, trade, and security. The next Secretary-General will therefore need to be more than a diplomat. He or she must be a bridge-builder capable of restoring confidence between North and South, developed and developing economies, creditors and debtors, and established and emerging powers.
The North–South divide is no longer just a matter of development assistance. It is a structural fault line in the global order. For many countries in the Global South, the postwar multilateral system has come to feel like an arrangement designed by and for the developed world, one that offers them limited voice in the institutions that shape the rules of trade, finance, and security.
At the same time, many developed countries face domestic pressure to reduce spending on international institutions and to prioritize national security over global commitments. Climate finance has become a central test of this divide. Developing countries argue that the North has failed to deliver on its promises, while the North insists that new
mechanisms and private capital must play a larger role. This mutual distrust weakens the foundation of cooperation the UN was meant to sustain.
The next Secretary-General will need to engage directly with these tensions, not as a peripheral issue but as a core challenge. That means recognizing that the credibility of the UN depends in large part on whether the Global South sees it as a platform that reflects their interests and priorities, and whether the Global North sees it as a realistic mechanism for managing shared risks and building long-term stability.
The stakes could hardly be higher. The choice of the next Secretary-General may prove to be one of the most consequential decisions of the coming decade. Across Ukraine, the Middle East, the Democratic Republic of the Congo, and other conflict zones, the effectiveness of multilateral diplomacy is being tested under severe strain. At the same time, the world faces rising debt burdens, climate stress, humanitarian crises, technological disruption, and accelerating economic fragmentation.
Recent years have exposed the limits of the post-1945 multilateral architecture. From Ukraine to Gaza, from Afghanistan to the Democratic Republic of the Congo, the United Nations has often appeared constrained in its ability to prevent conflict, enforce international norms, or mobilize decisive collective action. Whether fair or not, this perception has contributed to a growing belief that the institution is struggling to keep pace with the scale and complexity of contemporary challenges. Rebuilding confidence in the United Nations will require more than procedural reform; it will require leadership capable of restoring faith in the value of multilateral cooperation itself.
The question is no longer whether the United Nations must adapt. It is whether it can adapt quickly enough. An institution designed for the realities of 1945 cannot continue to operate as though the world has remained unchanged. The next Secretary-General must lead not only the administration of the United Nations, but its renewal.
Many member states today champion feminist foreign policy and place greater emphasis on inclusive leadership in international affairs. Against that backdrop, the selection of the next Secretary-General presents a historic opportunity for the United Nations to be led by a woman for the first time. Such a milestone would reflect the organization’s longstanding commitment to equality and representation, while reinforcing the principle that leadership should be determined by merit, experience, vision, and the ability to build consensus across diverse constituencies.
This is why the debate about succession is about far more than personalities. It is about the future relevance of multilateralism itself. If the United Nations is to remain the indispensable forum for international cooperation, it will require a leader capable of bridging divides, rebuilding trust, and reimagining the institution for a new era.
The decision made by member states will shape not only the future of the United Nations, but the credibility of multilateralism for a generation. At a moment when confidence in international institutions is under strain and geopolitical divisions are deepening, the world requires a Secretary-General capable of bridging divides, rebuilding trust, and demonstrating that collective action remains possible. The question before member states is therefore not simply who should lead the United Nations next. It is what kind of international order they are prepared to sustain.
