Child jockeys riding horses arrive to the finish line during a horse race at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 11, 2018. Picture taken July 11, 2018. REUTERS/B. Rentsendorj 

Child jockeys have their pictures taken and fingerprints registered before taking part in horse races at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 11, 2018. Picture taken July 11, 2018. REUTERS/B. Rentsendorj 

Child jockeys wait in line for a check up before a horse race at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 11, 2018. Picture taken July 11, 2018. REUTERS/B. Rentsendorj 

Child jockey Usukhbayar Otgonbayar, 11, waits for his horse trainer, or uyach, to do the send-off ceremony at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 11, 2018. Picture taken July 11, 2018. REUTERS/B. Rentsendorj 

Child jockeys riding horses head to the start line for the Soyolon horse race at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 12, 2018. Picture taken July 12, 2018. REUTERS/B. Rentsendorj 

Child jockey Bat-Erdene, 11, is seen on his horse at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 11, 2018. Picture taken July 11, 2018. REUTERS/B. Rentsendorj 

Viewers reach for the foam on a horse for good luck after the Soyolon horse race at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 12, 2018. Picture taken July 12, 2018. REUTERS/B. Rentsendorj 

Child jockeys ride their horses to the finish line during a horse race at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 12, 2018. Picture taken July 12, 2018. REUTERS/B. Rentsendorj 

A horse trainer or uyach prepares for the send-off ceremony next to a jockey at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 11, 2018. Picture taken July 11, 2018. REUTERS/B. Rentsendorj 

Viewers wait for a horse race to start at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 11, 2018. Picture taken July 11, 2018. REUTERS/B. Rentsendorj 

Child jockeys riding horses head to the start line for the Soyolon horse race at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 12, 2018. Picture taken July 12, 2018. REUTERS/B. Rentsendorj 

Uyach, or horse trainers, look to the check up points for their horses and jockeys at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 11, 2018. Picture taken July 11, 2018. REUTERS/B. Rentsendorj 

Child jockeys riding horses arrive to the finish line during a horse race at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 11, 2018. Picture taken July 11, 2018. REUTERS/B. Rentsendorj 

Child jockeys riding horses arrive to the finish line during a horse race at the Mongolian traditional Naadam festival, on the outskirts of Ulaanbaatar, Mongolia July 11, 2018. Picture taken July 11, 2018. REUTERS/B. Rentsendorj 

Mongolian President Tsakhiagiin Elbegdorj (L) looks at Japan's Prime Minister Shinzo Abe shooting a bow and arrow as heads of delegations attend traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Bazarsukh Rentsendorj 

South Korean President Park Geun-hye listens to Mongolian President Tsakhiagiin Elbegdorj as German Chancellor Angela Merkel and other heads of delegations attend traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Bazarsukh Rentsendorj 

Performers tune their instruments as they wait for delegations to arrive for traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Damir Sagolj 

Performers wait for delegations to arrive for traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Damir Sagolj 

Performers fix make-up and costumes as they wait delegations to arrive for traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Damir Sagolj 

Performers warm-up as they wait for delegations to arrive for traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Damir Sagolj 

Performers wait for delegations to arrive for traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Damir Sagolj 

Performers wearing traditional clothes take pictures of themselves as they wait delegations to arrive for traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Damir Sagolj 

Performers help each other with costumes as they wait delegations to arrive for traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Damir Sagolj 

Performers wearing traditional clothes take pictures of themselves as they wait for delegations to arrive for traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Damir Sagolj TPX IMAGES OF THE DAY

Croatia's President Kolinda Grabar-Kitarovic, European Council President Donald Tusk, South Korean President Park Geun-hye, Mongolian President Tsakhiagiin Elbegdorj, German Chancellor Angela Merkel and other heads of delegations watch traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Damir Sagolj 

European Council President Donald Tusk, Mongolian President Tsakhiagiin Elbegdorj, German Chancellor Angela Merkel and other heads of delegations watch traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Damir Sagolj 

German Chancellor Angela Merkel looks at Mongolian President Tsakhiagiin Elbegdorj as they and other heads of delegations watch traditional nomadic Naadam festival performance during the Asia-Europe Meeting (ASEM) summit just outside Ulaanbaatar, Mongolia, July 15, 2016. REUTERS/Damir Sagolj TPX IMAGES OF THE DAY

A boy pushes a cart loaded with a sheep after selling it to a customer ahead of the Naadam Festival, near Khui Doloon Hudag outside Ulan bator, July 10, 2015. Naadam is the biggest event in the Mongolian calendar held from July 11 to 13, on the anniversary of the Mongolian revolution of 1921. Concerts, fairs and traditional sports like wrestling, archery and horse racing are held during the celebration. REUTERS/B. Rentsendorj

Children ride horses during a horse race as part of the Naadam Festival celebration at Khui Doloon Hudag outside Ulan bator, July 10, 2015. Naadam is the biggest event in the Mongolian calendar held from July 11 to 13, on the anniversary of the Mongolian revolution of 1921. Concerts, fairs and traditional sports like wrestling, archery and horse racing are held during the celebration. REUTERS/B. Rentsendorj

Mongolia's Prime Minister Chimed Saikhanbileg (R) speaks to India's Prime Minister Narendra Modi in front of yurts as they attend a Naadam festival celebration on the outskirts of Ulan Bator, Mongolia, May 17, 2015. India will open a $1 billion credit line to bolster Mongolia's "economic capacity and infrastructure", Saikhanbileg and Modi announced on Sunday. REUTERS/B. Rentsendorj 

India's Prime Minister Narendra Modi (C) draws a bow next to his Mongolian counterpart Chimed Saikhanbileg (4th R) as they attend a Naadam festival celebration on the outskirts of Ulan Bator, Mongolia, May 17, 2015. India will open a $1 billion credit line to bolster Mongolia's "economic capacity and infrastructure", Saikhanbileg and Modi announced on Sunday. REUTERS/B. Rentsendorj TPX IMAGES OF THE DAY

Mongolians place the Nine Flags during the annual Naadam Festival in Ulan Bator July 11, 2013. Naadam is the biggest event in the Mongolian calendar held from July 11 to 13, on the anniversary of the Mongolian revolution of 1921. Concerts, fairs and traditional sports like wrestling, archery and horse racing are held during the celebration. REUTERS/B.Rentsendorj (MONGOLIA - Tags: ANNIVERSARY SOCIETY) 

Residents touch a horse of a competitor at a horse race during the Naadam Festival in Khui Doloon Khudag, outside Ulan Bator July 12, 2012. Naadam is the biggest event in the Mongolian calendar held from July 11 to 13, on the anniversary of the Mongolian revolution of 1921. Concerts, fairs and traditional sports like wrestling, archery and horse racing are held during the celebration. REUTERS/B.Rentsendorj (MONGOLIA - Tags: SPORT HORSE RACING SOCIETY ANNIVERSARY) 

Mongolian wrestlers attend annual Naadam Festival in Ulan Bator, July 11, 2012. Naadam is the biggest event in the Mongolian calendar held from July 11 to 13, on the anniversary of the Mongolian revolution of 1921. Concerts, fairs and traditional sports like wrestling, archery and horse racing are held during the celebration. REUTERS/B.Rentsendorj (MONGOLIA - Tags: SOCIETY SPORT WRESTLING) 

Mongolian wrestlers compete during wrestling competition at the annual Naadam Festival in Ulan Bator, July 11, 2012. Naadam is the biggest event in the Mongolian calendar held from July 11 to 13, on the anniversary of the Mongolian revolution of 1921. Concerts, fairs and traditional sports like wrestling, archery and horse racing are held during the celebration. REUTERS/B.Rentsendorj (MONGOLIA - Tags: SOCIETY SPORT WRESTLING) 

Children ride horses during a horse racing competition at the annual Naadam Festival in Ulan Bator July 12, 2011. Naadam is the biggest event in the Mongolian calendar held from July 11 to 13, on the anniversary of the Mongolian revolution of 1921. Concerts, fairs and traditional sports like wrestling, archery and horse racing are held during the celebration. Picture taken July 12, 2011. REUTERS/Zeev Rozen (MONGOLIA - Tags: ANNIVERSARY SOCIETY ANIMALS) 

Children ride horses across the field as they follow the horseman to the starting point before the race at the annual Naadam Festival in Ulan Bator July 12, 2011. Naadam is the biggest event in the Mongolian calendar held on July 11 to 13, on the anniversary of the Mongolian revolution of 1921. Concerts, fairs and traditional sports like wrestling, archery and horse racing are held during the celebration. REUTERS/Zeev Rozen (MONGOLIA - Tags: ANNIVERSARY SOCIETY IMAGES OF THE DAY) 

Children aged between six to 10 walks out of a yurt before they attend a horse racing competition at the annual Naadam Festival in Ulan Bator July 12, 2011. Naadam is the biggest event in the Mongolian calendar held on July 11 to 13, on the anniversary of the Mongolian revolution of 1921. Concerts, fairs and traditional sports like wrestling, archery and horse racing are held during the celebration. REUTERS/Zeev Rozen (MONGOLIA - Tags: ANNIVERSARY SOCIETY) 

Mongolian archers compete during an archery competition at the annual Naadam Festival in Ulan Bator July 11, 2011. Naadam is the biggest event in the Mongolian calendar held on July 11 to 13, on the anniversary of the Mongolian revolution of 1921. Concerts, fairs and traditional sports like wrestling, archery and horse racing are held during the celebration. REUTERS/Zeev Rozen (MONGOLIA - Tags: ANNIVERSARY SOCIETY) 

Mongolian archers perform during the opening ceremony of the annual Naadam Festival in Ulan Bator July 11, 2011. Naadam is the biggest event in the Mongolian calendar held from July 11 to 13, on the anniversary of the Mongolian revolution of 1921. Concerts, fairs and traditional sports like wrestling, archery and horse racing are held during the celebration. REUTERS/Zeev Rozen (MONGOLIA - Tags: ANNIVERSARY SOCIETY) 

Mongolian top wrestlers pay respect to the Nine Flags before the wrestling competition at the annual Naadam Festival in Ulan Bator July 11, 2011. Naadam is the biggest event in the Mongolian calendar held from July 11 to 13, on the anniversary of the Mongolian revolution of 1921. Concerts, fairs and traditional sports like wrestling, archery and horse racing are held during the celebration. REUTERS/Zeev Rozen (MONGOLIA - Tags: ANNIVERSARY SOCIETY) 

Russian President Dmitry Medvedev (L) and his Mongolian counterpart Tsakhiagiin Elbegdorj shoot arrows during a celebration of the Mongolian festival of Naadam, outside Ulan Bator, August 26, 2009. REUTERS/Zeev Rozen (MONGOLIA POLITICS) 

Mongolia's President Nambariin Enkhbayar shoots an arrow to kick off an archery competition during Mongolia's annual National Naadam in Ulan Bator July 11, 2008. The festival opened on Friday in the central stadium of the capital. The word "Naadam" means game or competition in Mongolian, according to Xinhua News Agency. REUTERS/Zeev Rozen (MONGOLIA) 

The son of a wrestler walks in a stadium during Mongolia's annual National Naadam in Ulan Bator July 11, 2008. The festival opened on Friday in the central stadium of Ulan Bator. The word "Naadam" means game or competition in Mongolian, according to Xinhua News Agency. REUTERS/Zeev Rozen (MONGOLIA) 

Japan's Crown Prince Naruhito (L), accompanied by Mongolian President Nambariin Enkhbayar (2nd L), attends the Naadam festival in Ulan Bator July 11, 2007. Crown Prince Naruhito is visiting Mongolia to mark the 35th anniversary of diplomatic relations between the countries. REUTERS/Zeev Rozenberg (MONGOLIA) 

Japan's Crown Prince Naruhito (L), accompanied by Mongolian President Nambariin Enkhbayar, watches performances during the Naadam festival in Ulan Bator July 11, 2007. Crown Prince Naruhito is visiting Mongolia to mark the 35th anniversary of diplomatic relations between the countries. REUTERS/Zeev Rozenberg (MONGOLIA) 

Mongolian security men rest in a tent outside the main stadium of Ulam Bator during the opening of the Naadam festival in town July 11, 2006. Mongolia will celebrate 800 years since Genghis Khan united the nation. Celebrations around the country will culminate in a national festival which starts on Tuesday in the capital. REUTERS/Nir Elias (MONGOLIA) 

A Mongolian man poses with his bird outside the main stadium of Ulam Bator during the opening of the Naadam festival in town July 11, 2006. Mongolia will celebrate 800 years since Genghis Khan united the nation. Celebrations around the country will culminate in a national festival which starts on Tuesday in the capital. REUTERS/Nir Elias (MONGOLIA) 

A Mongolian man arrives at the main stadium of Ulam Bator for the opening of the Naadam festival in town July 11, 2006. Mongolia will celebrate 800 years since Genghis Khan united the nation. Celebrations around the country will culminate in a national festival which starts on Tuesday in the capital. REUTERS/Nir Elias (MONGOLIA) 

A Mongolian man sits outside the main stadium of Ulam Bator during the opening of the Naadam festival in town July 11, 2006. Mongolia will celebrate 800 years since Genghis Khan united the nation. Celebrations around the country will culminate in a national festival which starts on Tuesday in the capital. REUTERS/Nir Elias (MONGOLIA) 

A Mongolian on a horse back performs a traditional ritual as part of the opening events of the Naadam festival in Ulan Bator July 10, 2006. [This year's festival is bigger than ever, as Mongolia celebrates 800 years since Genghis Khan united the nation. Celebrations around the country will culminate in a national festival in the capital on July 11.] 

A Mongolian on a horse back performs a traditional ritual as part of the opening events of the Naadam festival in Ulan Bator July 10, 2006. This year's festival is bigger than ever, as Mongolia celebrates 800 years since Genghis Khan united the nation. Celebrations around the country will culminate in a national festival in the capital on July 11. REUTERS/Nir Elias (MONGOLIA) 

Mongolians perform a traditional ritual as part of the opening events of the Naadam festival in Ulan Bator July 10, 2006. This year's festival is bigger than ever, as Mongolia celebrates 800 years since Genghis Khan united the nation. Celebrations around the country will culminate in a national festival in the capital on July 11. REUTERS/Nir Elias (MONGOLIA) 

Mongolians perform a traditional ritual as part of the opening events of the Naadam festival in Ulan Bator July 10, 2006. This year's festival is bigger than ever, as Mongolia celebrates 800 years since Genghis Khan united the nation. Celebrations around the country will culminate in a national festival in the capital on July 11. REUTERS/Nir Elias (MONGOLIA) 

Mongolians perform a traditional ritual as part of the opening events of the Naadam festival in Ulan Bator July 10, 2006. This year's festival is bigger than ever, as Mongolia celebrates 800 years since Genghis Khan united the nation. Celebrations around the country will culminate in a national festival in the capital on July 11. REUTERS/Nir Elias (MONGOLIA) 

Mongolian soldiers parade during the opening ceremony of the annual Naadam festival in the town of Arvaikheer, some 400 km (250 miles) west of Ulan Bator, July 9, 2006. This year's festival is bigger than ever, as Mongolia celebrates 800 years since Genghis Khan united the nation. Celebrations around the country will culminate in a national festival in the capital on July 11. REUTERS/Nir Elias (MONGOLIA) 

Mongolians arrive at the stadium to watch the annual Naadam festival in the town of Arvaikheer, some 400 km (250 miles) west of Ulan Bator, July 9, 2006. This year's festival is bigger than ever, as Mongolia celebrates 800 years since Genghis Khan united the nation. Celebrations around the country will culminate in a national festival in the capital on July 11. REUTERS/Nir Elias (MONGOLIA) 

A Mongolian marching band musician plays at the opening ceremony of the annual Naadam festival in the town of Arvaikheer, some 400 km (250 miles) west of Ulan Bator, July 9, 2006. This year's festival is bigger than ever, as Mongolia celebrates 800 years since Genghis Khan united the nation. Celebrations around the country will culminate in a national festival in the capital on July 11. REUTERS/Nir Elias (MONGOLIA)