What is the fine-grained topic of the following text: Aleksandr Kharlov (Russian: Алекса́ндр Ха́рлов; born March 18, 1958) is a retired hurdler from the Soviet Union, best known for winning the bronze medal at the inaugural 1983 World Championships in the men's 400 m hurdles. Only return the topic.
Aleksandr Kharlov's career as a Soviet Union hurdler