Detained: Vjekoslav Prebeg (Croatia), Dylan Healy and John Harding (UK), Mathias Gustafsson (Sweden) and Andrew Hill from Britain, during a court hearing in Donetsk, August 2022. Alexander Ermochenko/Reuters/Alamy stock photo

Ukraine war: prisoner swaps have been going on for centuries – here’s how they work

Five British nationals were part of a prisoner swap with Russia recently. Here’s what international law tells us about the detention and treatment of people taken in time of conflict.

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