In this Monday, Dec. 9, 2019, file photo, French President Emmanuel Macron, left, Russian President Vladimir Putin, second left, German Chancellor Angela Merkel, right, and Ukrainian President Volodymyr Zelenskiy, second right, arrive for a working session at the Elysee Palace in Paris, France. Russia's envoy at the talks with Ukraine and Russia-backed separatists said Monday, Dec. 23, 2019, they agreed on terms of exchanging prisoners following an agreement reached by the nations' presidents in Paris earlier this month. (AP Photo/Thibault Camus, Pool, File)
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