Russia and Ukraine have agreed to their largest-ever prisoner exchange. The agreement followed two days of US-mediated talks in Abu Dhabi. The final number of prisoners is expected to be announced later. US envoys Jared Kushner and Steve Witkoff are due to meet Russian President Vladimir Putin in Moscow. Russia and Ukraine have agreed to carry out their largest-ever prisoner exchange following two days of US-mediated talks in Abu Dhabi, US envoy Jared Kushner said Wednesday.