The Belgian region of Wallonia rejected new amendments to a planned EU-Canada free trade agreement on Thursday, reaffirming its opposition and so threatening the entire deal, a flagship of European Union trade policy.

All 28 EU governments support the Comprehensive Economic and Trade Agreement (CETA), but Belgium cannot give assent without backing from five sub-federal administrations and French-speaking Wallonia has steadfastly opposed it.

Failure to strike a deal with such a like-minded country as Canada would call into question the EU's ability to forge other deals and damage credibility already battered by Britain's vote to leave the bloc and disputes over the migration crisis.