MOSCOW (Reuters) -Russia and Ukraine carried out the latest in series of prisoner of war exchanges on Saturday, with both sides returning around 50 people, officials in Moscow and Kyiv said. Ukraine’s military intelligence directorate reported the return of 52 detainees, among them soldiers, sailors, border guards, national guard members and doctors. Ukrainian President Volodymyr Zelenskiy said that since March, Russia had freed a total of 1,031 prisoners. “We remember all those who are held captive in Russia and on occupied territory and will do everything to ensure that each and every one is…