By Andrew Galbraith SHANGHAI (Reuters) – Asian stocks came under renewed pressure on Wednesday and oil prices jumped after rising worries about the impact of aggressive sanctions against Russia over its invasion of Ukraine sank shares in Europe and on Wall Street. As global sanctions against Moscow tighten, the United States is poised to ban Russian flights using American airspace, following similar moves by the European Union and Canada. U.S. President Joe Biden is expected to announce the ban during his State of the Union speech beginning at 0200 GMT on Tuesday, in which he will also accuse …

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