A proxy battle between two of South America's most consequential leaders
In the corridors of global diplomacy, the succession to the United Nations' highest office has become a mirror for a deeper ideological contest. Brazil's Lula and Argentina's Milei — two leaders whose visions of governance stand in sharp opposition — are now projecting their rivalry onto the world stage, each maneuvering to shape who will lead the UN from 2027. The candidates in the running, among them Michelle Bachelet and Rafael Grossi, carry not only their own credentials but the weight of competing ideas about what international institutions are for and whom they should serve.
- A bureaucratic succession has transformed into a geopolitical flashpoint, with Lula and Milei treating the UN Secretary-General race as an extension of their domestic and regional rivalry.
- The ideological stakes are acute: a Lula-backed Secretary-General would likely champion climate action and Global South priorities, while a Milei-aligned choice could push back against what he sees as multilateral overreach.
- Four serious candidates — Bachelet, Grossi, Sall, and a fourth contender — are now making formal presentations to member states, even as the real contest unfolds in back-channel lobbying and coalition-building.
- Neither South American leader holds a veto, and the Security Council's permanent five will ultimately decide — meaning the Brazil-Argentina rivalry may be overtaken by the calculations of Washington, Beijing, and Moscow.
The race to lead the United Nations has become something more than a diplomatic formality. It has turned into a proxy contest between Brazil's Luiz Inácio Lula da Silva and Argentina's Javier Milei — two leaders whose ideological opposition now extends from domestic politics to the global stage. With António Guterres's tenure ending and a new Secretary-General set to take office in 2027, both are working hard to ensure their preferred candidate prevails.
The stakes are real. The Secretary-General shapes the UN's priorities on everything from climate change to conflict resolution, and for Lula — who has cast Brazil as a champion of the Global South — the office represents a chance to amplify progressive causes at the highest level. For Milei, whose government has embraced austerity and skepticism toward multilateral institutions, the succession is an opportunity to resist what he sees as ideological capture of international bodies.
Four candidates have entered the formal race: Michelle Bachelet, the former Chilean president with deep UN experience in human rights; Rafael Grossi, the IAEA director known for managing complex international negotiations; Macky Sall, offering Africa a rare claim to the role; and a fourth contender. Formal presentations are underway, though the harder work — lobbying, coalition-building, regional alignment — is happening behind closed doors.
The contest reflects a broader fracture in Latin American politics, with Lula's government emphasizing social investment and multilateral solidarity while Milei's has moved Argentina closer to Washington and away from international regulatory frameworks. Yet neither leader holds decisive power here. The UN Security Council's permanent five members must agree on a candidate before the General Assembly confirms the choice — meaning the rivalry between Brasília and Buenos Aires may ultimately yield to the calculations of larger powers.
The race to lead the United Nations is shaping up as something more than a bureaucratic succession. It has become a proxy battle between two of South America's most consequential leaders—Brazil's Luiz Inácio Lula da Silva and Argentina's Javier Milei—whose ideological opposition and regional rivalry are now playing out on the global stage. The position of UN Secretary-General, vacant after António Guterres's tenure ends, will be filled by someone taking office in 2027, and both leaders are maneuvering hard to ensure their preferred candidate prevails.
The stakes are substantial. Whoever leads the United Nations for the next five years will shape the organization's priorities, tone, and response to everything from climate change to conflict resolution to economic inequality. For Lula, who has positioned Brazil as a voice for the Global South and progressive causes, the Secretary-General's office represents an opportunity to amplify those priorities at the highest diplomatic level. For Milei, whose libertarian-inflected government has taken a sharply different ideological path, the succession is a chance to ensure the UN does not become a vehicle for what he views as overreach by international bureaucracies.
Four major candidates have emerged in the formal race. Michelle Bachelet, the former president of Chile and a seasoned diplomat with deep UN experience, represents a moderate progressive option with strong credentials in human rights. Rafael Grossi, who leads the International Atomic Energy Agency, brings technical expertise and a track record managing complex international negotiations. Macky Sall, Senegal's president, offers representation from Africa, a continent whose voice in UN leadership has historically been limited. A fourth candidate rounds out the field, though the focus has centered on these three.
The presentations have begun in earnest. The UN is conducting formal introductions of each candidate, a process designed to give member states a chance to assess their vision and qualifications. But the choreography of these presentations masks the harder work happening behind closed doors—the lobbying, the coalition-building, the careful calculation of which regional blocs will throw their weight behind whom.
Brazil and Argentina's contest reflects a deeper fracture in Latin American politics. Lula's Workers' Party government emphasizes social spending, environmental protection, and alignment with other developing nations on issues of global justice. Milei's administration, by contrast, has moved Argentina closer to the United States, embraced austerity, and expressed skepticism toward multilateral institutions that Milei sees as inefficient or ideologically captured. These differences are not merely domestic—they ripple outward into how each country votes on international bodies and whom they support for leadership roles.
The UN Secretary-General position carries real power, though often underestimated. The office sets the agenda for the organization's work, appoints senior staff, and serves as a moral voice on global crises. A Secretary-General aligned with Lula's vision would likely prioritize climate action, inequality reduction, and the interests of developing nations. One favored by Milei might take a more restrained approach to international regulation and emphasize efficiency and sovereignty.
Neither Brazil nor Argentina can unilaterally choose the next Secretary-General—that power rests with the UN Security Council's five permanent members, who must agree on a candidate, and ultimately the General Assembly. But both countries have influence, regional allies, and the ability to shape which candidates gain momentum. The coming months will reveal how effectively each leader can build a coalition and whether their rivalry will dominate the succession process or whether other powers—the United States, China, Russia, Europe—will ultimately determine the outcome.
A Conversa do Hearth Outra perspectiva sobre a história
Why does it matter who leads the UN? Isn't the Secretary-General mostly a figurehead?
The Secretary-General sets the organization's priorities and speaks for it on the world's biggest problems. That's not nothing. If you care about climate action or human rights or how conflicts get resolved, you care who holds that office.
So Lula and Milei are fighting over this because they want to control the UN?
Not control exactly, but shape it. Lula sees the UN as a platform for the Global South's interests. Milei sees it as bloated and ideologically driven. They're fighting for a Secretary-General who shares their view of what the world needs.
Can they actually win? Don't the permanent Security Council members decide?
They do, ultimately. But Brazil and Argentina have regional influence and allies. They can push candidates forward, build momentum, make it harder for others to ignore their preferences.
What happens if Milei's candidate wins instead of Lula's?
The UN's priorities shift. Less emphasis on climate and inequality, maybe more on efficiency and state sovereignty. It's not a revolution, but it matters for what gets attention and resources.
Is this rivalry just about ideology, or is there something personal between them?
Both. They represent opposite poles of Latin American politics right now. But it's also structural—two major powers in the region competing for influence. The UN succession is just where that competition is visible.