Brazil has taken an unprecedented step in its relations with neighbouring Argentina, announcing on Tuesday that it is reducing bilateral diplomatic ties to the level of Chargé d'Affaires — a significant downgrade that stops short of a full rupture but marks the most serious crisis between the two countries in decades. The move comes after Argentine President Javier Milei repeatedly called Brazilian President Luiz Inácio Lula da Silva a "thief" and a "convict" in public statements over the past week.
The Brazilian Foreign Ministry, known as the Itamaraty, informed Argentina's ambassador in Brasília, Guillermo Daniel Raimondi, that he could return to Buenos Aires, as the Brazilian government would henceforth deal only with a chargé d'affaires — a lower-ranking diplomatic stand-in. At the same time, Brazil's own ambassador to Argentina, Julio Bitelli, who had been recalled to Brasília in late July following an earlier incident, will not be returning to Buenos Aires. According to the Associated Press, this formal downgrade is without precedent in the recent history of relations between the two South American neighbours, which are each other's most important trading partners and longstanding allies.
The confrontation escalated from a speech Milei gave in São Paulo last weekend at the campaign launch of Senator Flávio Bolsonaro — son of former Brazilian President Jair Bolsonaro — who is set to challenge Lula in October's presidential election. In that speech, Milei called Lula a thief and a convict, and referred to Brazilian Supreme Court Justice Alexandre de Moraes in crude, insulting terms. Milei, who leads a libertarian movement and is ideologically opposed to Lula's left-wing Workers' Party, doubled down on Sunday in a television interview, saying: "Calling a thief a thief is far less serious than the act of stealing itself." He also accused Lula of spreading "the filthy ideas of socialism" across the region. Argentina's government initially sought to play down the row, with Buenos Aires describing it as a matter of "ideological and political differences," and after Tuesday's announcement Argentina's foreign ministry said it "regrets Brazil's decision to continue isolating itself from the rest of the region for purely ideological reasons."
Why this matters: Brazil and Argentina share not only a long border but deep economic interdependence and a foundational role in South American regional institutions. A sustained diplomatic freeze between the two largest economies in Latin America could ripple across the region's political and trade architecture. The clash also reflects a wider continental fault line between left-leaning governments, represented by Lula, and a new wave of right-wing populism embodied by Milei, who has aligned himself closely with US President Donald Trump and drawn support from Trump's circle for Flávio Bolsonaro's candidacy. With Brazil's presidential election approaching in October, the diplomatic row is unlikely to be resolved quickly.