Five of CNN's correspondents gathered recently to discuss how the world changed in 2015 and what may come in the year ahead. Nick Paton Walsh, Nima Elbagir, Ivan Watson, Clarissa Ward and Arwa Damon sat down with videographer Claudia Morales and talked about the stories, issues and people they had covered. See their conversations in a series of videos and catch up on the key stories of our time. Here, Russia. Also in the series: ISIS; the refugee crisis