Ukraine’s capital Kyiv came under a large-scale Russian drone and missile attack overnight into Saturday, just hours after Russia and Ukraine began a major prisoner exchange.

Russia and Ukraine were set to take part in a major prisoner swap on Friday, described as the biggest since the start of the full-scale Russian invasion in 2022. Officials from both countries agreed to exchange 1,000 prisoners of war each, during otherwise fruitless peace negotiations in Istanbul a week ago.

CHERNIHIV REGION, Ukraine (AP) — An exchange of prisoners between Russia and Ukraine from their more than three-year war was underway Friday, a senior Ukrainian official said. The swap was not yet finished, according to the official, who spoke on condition of anonymity because he was not authorized to speak publicly.