The U.S. government on Friday said it would increase tariffs on aircraft imported from the European Union to 15% from 10%, ratcheting up pressure on Brussels in a nearly 16-year transatlantic dispute over aircraft subsidies.
EU officials have said they want to negotiate with Washington but will not be bullied into submission.
EU officials had no immediate comment on Friday's news.
The WTO in October had awarded Washington the right to impose tariffs on $7.5 billion of annual EU imports in its case against Airbus.
"The EU and Airbus could end these tariffs by finally complying with their legal obligations, ending these illegal subsidies, and addressing their ongoing harm.