CHERNIHIV REGION, Ukraine (AP) — Russia and Ukraine began a major prisoner exchange, swapping hundreds of soldiers and civilians in the first phase of an exchange that was a moment of cooperation in otherwise failed efforts to reach a ceasefire in the 3-year-old war. President Volodymyr Zelenskyy said the first phase of the exchange brought home 390 Ukrainians, including soldiers and civilians, with further releases expected over the weekend that will make it the largest swap of the war. Russia said it had received the same number from Ukraine. Kyiv and Moscow agreed in Istanbul last week to the exchange of 1,000 prisoners from each side in their first direct peace talks since the early weeks of Russia’s 2022 invasion.