Brussels: The Mercosur deal has cleared nearly every hurdle Europe built for it, and now it hangs on two forces the Commission cannot command, a courtroom in Luxembourg and a farm lobby in Paris.

The pact ties the European Union to Argentina, Brazil, Paraguay and Uruguay in what would become one of the world’s largest free trade zones. After twenty-five years of on-and-off talks, the Council greenlit signature in January 2026, and all four South American governments finished their own ratifications by mid-March, with Paraguay the last to sign off on 17 March.

Brussels then did what it can do alone. Because the interim trade agreement falls under the EU’s exclusive competence, the Commission began applying it provisionally on 1 May 2026, scrapping tariffs on a range of goods from day one. That move let the deal start working for exporters of cars, machinery and wine without waiting for every national parliament.

The wider partnership agreement is another matter, and here the deal meets resistance. It still needs the consent of the European Parliament and ratification by all twenty-seven member states. In January, lawmakers voted to refer the agreement to the Court of Justice over legal concerns, a step that could delay entry into force by up to two years and, opponents hope, sink it.

France leads that opposition. As the bloc’s largest agricultural producer, it argues the Mercosur deal will flood the market with cheaper beef, sugar and poultry raised under looser environmental and animal welfare rules. President Emmanuel Macron has said France will vote against the pact, a promise he made after thousands of farmers drove tractors into Paris and other cities in early 2026.

Supporters answer that Europe cannot preach open trade while blocking its own signature deal. The Commission frames Mercosur as strategic insurance, a way to lock in supplies of food, critical minerals and industrial markets at a moment when Washington and Beijing both weaponise trade. Losing it, they warn, would push South America closer to China, which has spent years buying influence across the continent.

The Council’s own explainer lays out the split of powers plainly, and that split is now the story. Brussels has pulled every lever it fully controls; what remains sits with judges and national politics, where farm anger travels faster than trade statistics.

So the Mercosur deal enters an odd limbo. Its trade core already shapes shipments across the Atlantic, yet its political future depends on whether governments can sell it at home. For a bloc that likes to call itself a trade superpower, the hardest negotiation may be the one with its own farmers.