Ukraine hopes to revive prisoner-of-war exchanges with Russia by the end of the year, President Volodymyr Zelensky said on Wednesday while speaking alongside Turkish President Tayyip Erdogan at a briefing in Ankara."Of course, we talked substantively about the situation in diplomacy. And now many processes have become more active, and we are trying to ensure that all activity is aimed specifically at peace," Zelensky said.A senior Ukrainian official told Reuters that Kyiv had received "signals"