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GLOBAL MARKETS-Stocks, metals hit by new U.S. trade war salvo


* U.S. raises stakes in China trade war * Asian, European stocks fall 1 percent, safe-havens gain broadly * Copper, zinc slide to 1-year low, oil also sharply lower * Yuan, Aussie dollar, Mexico peso, Taiwan dollar all slide LONDON, July 11 (Reuters) - Stocks fell and metals prices slumped to their lowest in a year on Wednesday, as U.S. threats of tariffs on an additional $200 billion worth of Chinese goods pushed the world's two biggest economies ever closer to a full-scale trade war. The detailing overnight of U.S. President Donald Trumps already-threatened 10 percent tariffs on an additional $200 billion of Chinese goods dampened hopes that Washington will eventually step back from the escalating