Dancers take part in a ballet master class by Nikolay Tsiskaridze during The World Ballet Holidays Festival in Moscow, Russia, on June 1, 2019. The World Ballet Holidays Festival is held from May 31 to June 2 at VDNH exhibition complex in Moscow. One of the highlights of the festival is an outdoor ballet class conducted by ballet dancer Nikolay Tsiskaridze. (Photo: Xinhua)

Dancers take part in a ballet master class by Nikolay Tsiskaridze during The World Ballet Holidays Festival in Moscow, Russia, on June 1, 2019. The World Ballet Holidays Festival is held from May 31 to June 2 at VDNH exhibition complex in Moscow. One of the highlights of the festival is an outdoor ballet class conducted by ballet dancer Nikolay Tsiskaridze. (Photo: Xinhua)

Ballet dancers get ready for a ballet master class by Nicolay Tsiskaridze during The World Ballet Holidays Festival in Moscow, Russia, on June 1, 2019. The World Ballet Holidays Festival is held from May 31 to June 2 at VDNH exhibition complex in Moscow. One of the highlights of the festival is an outdoor ballet class conducted by ballet dancer Nikolay Tsiskaridze. (Photo: Xinhua)

Ballet dancers get ready for a ballet master class by Nikolay Tsiskaridze during The World Ballet Holidays Festival, in Moscow, Russia, on June 1, 2019. The World Ballet Holidays Festival is held from May 31 to June 2 at VDNH exhibition complex in Moscow. One of the highlights of the festival is an outdoor ballet class conducted by ballet dancer Nikolay Tsiskaridze. (Photo: Xinhua)

Ballet dancers take part in a ballet master class by Nikolay Tsiskaridze during The World Ballet Holidays Festival, in Moscow, Russia, on June 1, 2019. The World Ballet Holidays Festival is held from May 31 to June 2 at VDNH exhibition complex in Moscow. One of the highlights of the festival is an outdoor ballet class conducted by ballet dancer Nikolay Tsiskaridze. (Photo: Xinhua)

Ballet dancers prepare for a ballet master class by Nikolay Tsiskaridze during The World Ballet Holidays Festival, in Moscow, Russia, on June 1, 2019. The World Ballet Holidays Festival is held from May 31 to June 2 at VDNH exhibition complex in Moscow. One of the highlights of the festival is an outdoor ballet class conducted by ballet dancer Nikolay Tsiskaridze. (Photo: Xinhua)

Ballet dancers prepare for a ballet master class by Nikolay Tsiskaridze during The World Ballet Holidays Festival, in Moscow, Russia, on June 1, 2019. The World Ballet Holidays Festival is held from May 31 to June 2 at VDNH exhibition complex in Moscow. One of the highlights of the festival is an outdoor ballet class conducted by ballet dancer Nikolay Tsiskaridze. (Photo: Xinhua)

Ballet dancers get ready for a ballet master class by Nicolay Tsiskaridze during the World Ballet Holidays Festival in Moscow, Russia, on June 1, 2019. The World Ballet Holidays Festival is held from May 31 to June 2 at VDNH exhibition complex in Moscow. One of the highlights of the festival is an outdoor ballet class conducted by ballet dancer Nikolay Tsiskaridze. (Photo: Xinhua)

Ballet dancers prepare for a ballet master class by Nikolay Tsiskaridze during the World Ballet Holidays Festival in Moscow, Russia, on June 1, 2019. The World Ballet Holidays Festival is held from May 31 to June 2 at VDNH exhibition complex in Moscow. One of the highlights of the festival is an outdoor ballet class conducted by ballet dancer Nikolay Tsiskaridze. (Photo: Xinhua)

Photo taken on June 1, 2019 shows the construction site of China State Construction Engineering Corporation (CSCEC)'s Central Dancers take part in a ballet master class by Nicolay Tsiskaridze during the World Ballet Holidays Festival in Moscow, Russia, on June 1, 2019. The World Ballet Holidays Festival is held from May 31 to June 2 at VDNH exhibition complex in Moscow. One of the highlights of the festival is an outdoor ballet class conducted by ballet dancer Nikolay Tsiskaridze. (Photo: Xinhua)