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https://www.theguardian.com/world/2020/mar/21/iran-frees-french-researcher-under-prisoner-exchange-dealRoland Marchal, whose colleague remains in detention, reportedly released in return for Iranian engineer. Emmanuel Macron says Iran has freed a French researcher imprisoned in the country, after France reportedly released an Iranian threatened with extradition to the US.Macron said on Saturday he was “ happy to announce the release of Roland Marchal, imprisoned in Iran since June 2019” and urged the Iranian authorities to immediately also free fellow researcher Fariba Adelkhah, the French president’s office said.France  has for months demanded that Iran release Adelkhah and her colleague,  Marchal, who were detained last year accused of plotting against  national security. Their trial began in early March....