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. (Xinhua/Maxim Chernavsky)