FILE - In this file photo dated Wednesday, May 8, 2019, Britain's National Security Adviser Mark Sedwill shakes hands with Chinese Foreign Minister Wang Yi, right, in Beijing. Britain’s top civil servant Mark Sedwill announced Sunday June 28, 2020, he will resign from his role as Cabinet Secretary, national security adviser and head of the Civil Service in September 2020. (Florence Lo/Pool FILE via AP)
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