This photo provided by U.S. Embassy Switzerland, Edward McMullen greets Xiyue Wang in Zurich, Switzerland on Saturday, Dec. 7, 2019. In a trade conducted in Zurich, Iranian officials handed over Chinese-American graduate student Xiyue Wang, detained in Tehran since 2016, for scientist Massoud Soleimani, who had faced a federal trial in Georgia. (U.S. Embassy Switzerland via AP)
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