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President Trump has thanked Iran for what he called "very fair" negotiations with the US, which led to a rare exchange of prisoners between the two countries. Mr Trump said the swap had proved that they could make deals together. Earlier, Iran released Xiyue Wang, an American PhD student who'd been jailed for spying - a charge he denied. In return, the US freed an Iranian scientist, Massoud Soleimani. Ali Vaez, Director of Iran Project at the International Crisis Group, explains more.

(Photo: Xiyue Wang, who was held in Iran for three years, was greeted by US Ambassador to Switzerland Edward McMullen. Credit: US Embassy, Bern)