A World Trade Organisation panel has upheld a ruling that China broke trade rules by restricting exports of rare earths, minerals used in high-tech products, including hybrid cars, mobile phones, wind turbines and energy-efficient lighting.
The organisation's appellate body affirmed a March ruling against China, in a significant victory for the US, EU and Japan.
Michael Froman, the US trade representative, said he was pleased that the US had prevailed in the case.
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