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.

The prisoner exchange, which is the sees the first 390 of an expected 1,000 released, was agreed at last week's peace talks in Turkey.