[7] Nadin made his debut at an International Ice Hockey Federation (IIHF) event, refereeing seven games at the 1972 Winter Olympics in Sapporo.
[1][4][6] Later in the same year, he conducted refereeing clinics for Russian ice officials, shortly before the Summit Series took place.
[8] Nadin returned to the international stage, refereeing games at the 1974 World Junior Ice Hockey Championships in Leningrad.
[11] He supported adding sticks to the list of dangerous equipment which referees were allowed to remove from a game.
[12] Also for player safety, he supported making face masks mandatory on hockey helmets,[13] and a reduction in physical aggression on the ice.
[2] He also conducted referee seminars in over 40 countries,[3] and implemented regulations on ice hockey goaltending equipment at IIHF events.
[20] Nadin received the Paul Loicq Award in 2007, for outstanding contributions to the IIHF, and international ice hockey.
[3] Nadin received the Pierre de Coubertin Medal in 2012, in recognition of his work in ice hockey at the Winter Olympic Games.
[1] He also has an extensive collection of lapel pins, mugs, photos, and pennants,[1] and has donated items to the Hockey Hall of Fame resource centre.