and researchers in the uk say they now know why swimming can significantly improve your mood. state media in russia is reporting that president putin has visited mariupol the ukrainian city which was captured by invading russian forces last year. (map)the tass news agency says he travelled there by helicopter, and visited local residents. it s mr putin s first trip to the ukrainian territory which has been occupied by russia since the invasion was launched just over a year ago. we ve received these pictures, which we understand to be mr putin in mariupol on saturday evening. he s shown driving around in a car, and also visiting what appears to be a child ren s playground. and other footage shows him visiting a theatre, and talking to a group of people on a street, before visiting a flat. the visit came at the end of a week when the russian president was charged by the international criminal court with forcible abductions of ukrainian children. the trip to mariupol which w