Brazil formally requested the recall of Argentina's ambassador on Monday and reduced its own diplomatic representation in Buenos Aires to chargé d'affaires level, escalating a war of words between the continent's two largest economies into a full diplomatic crisis.
The move came after Argentine President Javier Milei publicly called Brazilian President Luiz Inácio Lula da Silva a thief, according to international news reports. Brasilia's foreign ministry treated the remark as an insult to the office of the presidency rather than ordinary campaign rhetoric, triggering the formal downgrade.
Relations between the neighbors have been strained since Milei took office, with the libertarian president repeatedly clashing with Lula's left-of-center government over trade policy, Mercosur reform and regional alignment. But both governments had until now kept the friction below the threshold of formal diplomatic consequences.
The downgrade carries practical weight beyond symbolism. Brazil and Argentina are each other's largest regional trading partners, and pending negotiations — from automotive trade quotas to energy integration — now lack a full ambassadorial channel on either side.
Analysts noted that neither side has severed relations outright, leaving room for a negotiated climb-down. Previous South American diplomatic ruptures of this kind have typically been resolved within months, though rarely between countries so economically intertwined.