 Liukin was the first man to do a triple back flip on floor and both a layout Tkatchev and a Jaeger with full twist on high bar.He also currently has one of the three most difficult skills on floor exercise and second most difficult skills in men's artistic gymnastics named after him, the Liukin or triple back (tucked) somersault, which has a difficulty score of H (0.8).Liukin moved to the United States in 1992 and became a U.S. citizen in 2000.