David Satter, a US journalist working in Moscow, has been expelled by the Russian security services without explanation. Satter speaks exclusively to the the Guardian about the moment on Christmas Day when he was told that he was banned from the country.
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The P4 laboratory, on the campus of the Wuhan Institute of Virology, in Wuhan, in China's central Hubei province. (Hector Retamal/AFP via Getty Images)