Tokyo — US stock futures and Asian shares tumbled on Thursday after Canadian authorities arrested a top executive of Chinese tech giant Huawei for extradition to the US, feeding fears of a fresh flare-up in tensions between the two superpowers. The news came as Washington and Beijing begin three months of negotiations aimed at de-escalating their bruising trade war, which is adding to lingering investor jitters over higher US interest rates and other risks to global economic growth. S&P500 e-mini futures fell almost 2% at one point in thin Asian morning trade and were last were down 1.3%. The losses in the first few minutes of trading might have been even steeper, but CME Group’s Chicago Mercantile Exchange implemented a series of 10-second trading halts that helped limit the initial drop. Japan’s Nikkei slumped 1.8% by the midday break, with semi-conductor related shares leading the losses. Huawei is one of the world’s largest makers of smartphones and telecommunications network eq...

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