France saw hundreds of tractors circle Paris around the Arc de Triomphe on Tuesday morning in a new wave of protest against the EU-Mercosur trade deal.
Farmers drove their machines into the capital to show they oppose the pact the European Commission plans to sign in Paraguay on 17 January.
They say the agreement with Mercosur countries would let cheaper food into the EU and hurt their businesses.
The action added to earlier demonstrations and blockades at ports and roads across the country.
Unions say discussions with the government have not produced firm protections for local producers. President Emmanuel Macron has said France will vote against the deal at EU level, but most member states support it.