HAMBURG (Reuters) - The European Union will respond if the United States imposes punitive tariffs on steel, European Commission President Jean-Claude Juncker said on Friday at the G20 summit in Hamburg.

"Should the U.S. introduce tariffs on European steel imports, Europe is ready to react immediately and adequately," Juncker told reporters.

In a dig at U.S. President Donald Trump, he said that a new EU-Japan trade deal signed on Thursday showed that Europeans were not putting up "protectionist walls".

(Reporting by Noah Barkin in Hamburg and Elizabeth Miles in Brussels; Writing by Alastair Macdonald; editing by Robert-Jan Bartunek)

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