Facts:   - sport: swimming      - birth date: 1953    - club: dynamo batumi    - birth place: batumi , georgia   Based on these bullet points, write a short biography describing the life of viktor krasko .
viktor krasko -lrb- ; born 1953 -rrb- is a retired soviet backstroke swimmer who won a bronze medal in the 4 × 100 m medley relay at the 1970 european aquatics championships .