As global leaders digest the fallout from a stormy United Nations General Assembly in New York this week, China has strongly denied accusations from U.S. President Donald Trump that Beijing is trying to interfere in the U.S. midterm elections in November. Meanwhile, the diplomatic tussle has intensified between the United States and other signatories over the future of the 2015 Iran nuclear deal, as the U.S. prepares to hit Tehran with fresh sanctions. Henry Ridgwell reports.
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