The EU has proposed tariffs on $20bn (£15bn) of US goods in a long-running dispute over Boeing aircraft subsidies.
The proposal comes after the WTO said earlier this month that the US had failed to remove some Boeing subsidies.
The EU move comes after the US said it was considering tariffs on about $11bn (£8.4bn) worth of EU goods in response to Airbus subsidies.
And it comes after the EU approved plans in April for trade talks with the US designed to reduce trade barriers.
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