Performers form the Olympic rings during a show at the closing ceremony for the 2014 Sochi Winter Olympics, February 23, 2014. REUTERS/Eric Gaillard (RUSSIA - Tags: OLYMPICS SPORT TPX IMAGES OF THE DAY)

Fireworks explode over the Olympic Park during the closing ceremony for the 2014 Sochi Winter Olympics, February 23, 2014. REUTERS/Shamil Zhumatov (RUSSIA - Tags: SPORT OLYMPICS TPX IMAGES OF THE DAY) 

Belarus' Anton Kushnir competes during the men's freestyle skiing aerials qualification round at the 2014 Sochi Winter Olympic Games in Rosa Khutor February 17, 2014. REUTERS/Dylan Martinez (RUSSIA - Tags: SPORT SKIING OLYMPICS TPX IMAGES OF THE DAY)

A skier competes during the men's freestyle skiing halfpipe finals at the 2014 Sochi Winter Olympic Games in Rosa Khutor February 18, 2014. REUTERS/Mike Segar (RUSSIA - Tags: SPORT SKIING OLYMPICS TPX IMAGES OF THE DAY)

Shaun White of the U.S. crashes during the men's snowboard halfpipe final event at the 2014 Sochi Winter Olympic Games, in Rosa Khutor February 11, 2014. REUTERS/Lucas Jackson (RUSSIA - Tags: SPORT OLYMPICS SPORT SNOWBOARDING) 

Germany's Severin Freund lies on the snow after crashing during the first round of the men's ski jumping normal hill individual final event of the Sochi 2014 Winter Olympic Games, at the RusSki Gorki Ski Jumping Center in Rosa Khutor, February 9, 2014. REUTERS/Michael Dalder (RUSSIA - Tags: OLYMPICS SPORT SKIING)

France's Deborah Anthonioz, Faye Gulini of the U.S., Austria's Maria Ramberger, France's Nelly Moenne Loccoz and Eva Samkova (L-R) of the Czech Republic compete during the women's snowboard cross semi-finals at the 2014 Sochi Winter Olympic Games in Rosa Khutor February 16, 2014. REUTERS/Mike Blake (RUSSIA - Tags: OLYMPICS SPORT SNOWBOARDING)

Italy's Nadya Ochner competes during the women's snowboard parallel giant slalom qualification run at the 2014 Sochi Winter Olympic Games in Rosa Khutor February 19, 2014. REUTERS/Dylan Martinez (RUSSIA - Tags: OLYMPICS SPORT SNOWBOARDING TPX IMAGES OF THE DAY)

Sweden's Anna Holmlund (green bib), Canada's Kelsey Serwa (red bib), Austria's Katrin Ofner (blue bib) and Switzerland's Fanny Smith (yellow bib) competes during the women's freestyle skiing skicross semi-finals at the 2014 Sochi Winter Olympic Games in Rosa Khutor February 21, 2014. Picture taken with multiple exposure function. REUTERS/Lucas Jackson (RUSSIA - Tags: SPORT SKIING OLYMPICS TPX IMAGES OF THE DAY)

France's Alexis Pinturault skis during the downhill run of the men's alpine skiing super combined training session at the 2014 Sochi Winter Olympics at the Rosa Khutor Alpine Center February 13, 2014. REUTERS/Leonhard Foeger (RUSSIA - Tags: SPORT SKIING OLYMPICS)

Sweden's Johan Olsson skis during the men's 15 km cross-country classic event at the Sochi 2014 Winter Olympic Games in Rosa Khutor February 14, 2014. REUTERS/Carlos Barria (RUSSIA - Tags: SPORT SKIING OLYMPICS TPX IMAGES OF THE DAY)

Sarah Hendrickson of the U.S. soars through the air in her trial jump during the women's ski jumping individual normal hill event of the Sochi 2014 Winter Olympic Games, at the RusSki Gorki Ski Jumping Center in Rosa Khutor, February 11, 2014. REUTERS/Kai Pfaffenbach (RUSSIA - Tags: OLYMPICS SPORT SKIING)

China's Xu Mengtao performs a jump during the women's freestyle skiing aerials finals at the 2014 Sochi Winter Olympic Games in Rosa Khutor February 14, 2014. REUTERS/Mike Blake (RUSSIA - Tags: SPORT SKIING OLYMPICS TPX IMAGES OF THE DAY)

Russian Prime Minister Dmitry Medvedev skis at the Rosa Khutor Alpine Center during the 2014 Sochi Winter Olympics February 9, 2014.
REUTERS/Kai Pfaffenbach (RUSSIA - Tags: OLYMPICS SPORT SKIING POLITICS)

Two men sunbathe on the beach in Adler on a warm and sunny day during the 2014 Sochi Winter Olympics, February 13, 2014 REUTERS/Eric Gaillard (RUSSIA - Tags: OLYMPICS SPORT ENVIRONMENT TPX IMAGES OF THE DAY)

Masked members of Pussy Riot leave a police station in Adler during the 2014 Sochi Winter Olympics, February 18, 2014. Pussy Riot protest band members Maria Alyokhina and Nadezhda Tolokonnikova were released from police custody on Tuesday, Tolokonnikova's husband said hours after they were detained in Sochi, where Russia is holding the 2014 Winter Olympics. REUTERS/Shamil Zhumatov (RUSSIA - Tags: OLYMPICS SPORT CRIME LAW POLITICS ENTERTAINMENT)

Katie Uhlaender of the U.S. gets ready during a women's skeleton training session at the Sanki sliding center in Rosa Khutor, a venue for the Sochi 2014 Winter Olympics, near Sochi February 8, 2014. REUTERS/Murad Sezer (RUSSIAOLYMPICS SKELETON - Tags: SPORT OLYMPICS SKELETON) 

Austria's Reinhard Egger speeds down the track in the men's singles luge competition at the 2014 Sochi Winter Olympics February 9, 2014. REUTERS/Arnd Wiegmann (RUSSIA - Tags: OLYMPICS SPORT LUGE)

Irene Wust of the Netherlands skates to first place during the women's 3,000 metres speed skating race at the Adler Arena during the 2014 Sochi Winter Olympics February 9, 2014. REUTERS/Laszlo Balogh (RUSSIA - Tags: OLYMPICS SPORT SPEED SKATING TPX IMAGES OF THE DAY)

Kazakhstan's Nurbergen Zhumagaziyev (C) passes between J.R. Celski (R) and Eduardo Alvarez (front L) of the U.S. who both fell, and South Korea's Park Se-yeong and South Korea's Lee Ho-suk (back L), during the men's 5,000 metres short track speed skating relay semi-final event at the Iceberg Skating Palace during the 2014 Sochi Winter Olympics February 13, 2014. REUTERS/Lucy Nicholson (RUSSIA - Tags: SPORT SPEED SKATING OLYMPICS)

Canada's Meagan Duhamel (bottom) and Eric Radford compete during the figure skating pairs short program at the Sochi 2014 Winter Olympics, February 11, 2014. REUTERS/Alexander Demianchuk (RUSSIA - Tags: SPORT FIGURE SKATING OLYMPICS TPX IMAGES OF THE DAY)

Japan's Yuzuru Hanyu reacts with Japan figure skating coach Yoshiko Kobayashi in the "kiss and cry" area during the Figure Skating Men's Short Program at the Sochi 2014 Winter Olympics, February 13, 2014. REUTERS/Lucy Nicholson (RUSSIA - Tags: OLYMPICS SPORT FIGURE SKATING) 

Team members take part in various men's curling round robin games at the 2014 Sochi Olympics in the Ice Cube Curling Center in Sochi February 10, 2014. REUTERS/Mark Blinch (RUSSIA - Tags: OLYMPICS SPORT CURLING)

Russian men's hockey team players stretch at center ice during the team's first practice at the 2014 Sochi Winter Olympics, February 10, 2014. REUTERS/Brian Snyder (RUSSIA - Tags: TPX IMAGES OF THE DAY OLYMPICS SPORT ICE HOCKEY)

Canada's players huddle as they celebrate defeating Sweden in their men's ice hockey gold medal game at the Sochi 2014 Winter Olympic Games February 23, 2014. REUTERS/Mark Blinch (RUSSIA - Tags: SPORT ICE HOCKEY OLYMPICS TPX IMAGES OF THE DAY)

A fan waves a Russian flag before the men's preliminary round hockey game between Russia and USA at the Sochi 2014 Winter Olympic Games February 15, 2014. Picture taken with a fisheye lens. REUTERS/Mark Blinch (RUSSIA - Tags: OLYMPICS SPORT ICE HOCKEY TPX IMAGES OF THE DAY)

Second-placed Chloe Dufour-Lapointe (L) of Canada and her sister, first-placed Justine Dufour-Lapointe (R), hold hands during the flower ceremony for the women's freestyle skiing moguls event at the 2014 Sochi Winter Olympic Games in Rosa Khutor, February 8, 2014. REUTERS/Dylan Martinez (RUSSIA - Tags: SPORT SKIING OLYMPICS TPX IMAGES OF THE DAY)

Joint gold medalists Switzerland's Dominique Gisin (L) and Slovenia's Tina Maze pose during the medal ceremony for the women's alpine skiing downhill race at the Sochi 2014 Winter Olympic Games in Sochi February 12, 2014. REUTERS/Gary Hershorn (RUSSIA - Tags: SPORT SKIING OLYMPICS TPX IMAGES OF THE DAY)

Fireworks explode after the Olympic Cauldron is been lit during the opening ceremony of the 2014 Sochi Winter Olympics, February 7, 2014. REUTERS/Shamil Zhumatov (RUSSIA - Tags: SPORT OLYMPICS TPX IMAGES OF THE DAY) 

Four out of five Olympic rings are seen lit up during the opening ceremony of the 2014 Sochi Winter Olympics, February 7, 2014. REUTERS/David Gray (RUSSIA - Tags: OLYMPICS SPORT)