People dance at the Exhibition of Achievements of National Economy (VDNH) in Moscow, Russia, on Aug. 2, 2020. VDNH, an exposition, museum and recreational complex in Moscow, celebrated its 81st anniversary on Aug. 1 and Aug. 2 with a whole range of festive events. (Photo by Alexander Zemlianichenko Jr/Xinhua)

People enjoy themselves at the Exhibition of Achievements of National Economy (VDNH) in Moscow, Russia, on Aug. 2, 2020. VDNH, an exposition, museum and recreational complex in Moscow, celebrated its 81st anniversary on Aug. 1 and Aug. 2 with a whole range of festive events. (Photo by Alexander Zemlianichenko Jr/Xinhua)

People dance at the Exhibition of Achievements of National Economy (VDNH) in Moscow, Russia, on Aug. 2, 2020. VDNH, an exposition, museum and recreational complex in Moscow, celebrated its 81st anniversary on Aug. 1 and Aug. 2 with a whole range of festive events. (Photo by Alexander Zemlianichenko Jr/Xinhua)

People are seen at the Exhibition of Achievements of National Economy (VDNH) in Moscow, Russia, on Aug. 2, 2020. VDNH, an exposition, museum and recreational complex in Moscow, celebrated its 81st anniversary on Aug. 1 and Aug. 2 with a whole range of festive events. (Photo by Alexander Zemlianichenko Jr/Xinhua)

Artists perform at the Exhibition of Achievements of National Economy (VDNH) in Moscow, Russia, on Aug. 2, 2020. VDNH, an exposition, museum and recreational complex in Moscow, celebrated its 81st anniversary on Aug. 1 and Aug. 2 with a whole range of festive events. (Photo by Alexander Zemlianichenko Jr/Xinhua)

Artists perform at the Exhibition of Achievements of National Economy (VDNH) in Moscow, Russia, on Aug. 2, 2020. VDNH, an exposition, museum and recreational complex in Moscow, celebrated its 81st anniversary on Aug. 1 and Aug. 2 with a whole range of festive events. (Photo by Alexander Zemlianichenko Jr/Xinhua)