People watch a performance during Moscow City Day celebrations in Moscow, Russia, on Sept. 13, 2025.

A series of events are held on this weekend to celebrate the Moscow City Day and mark the city's 878th founding anniversary. (Xinhua/Hao Jianwei)

Commemorative events are held marking the Moscow City Day in Moscow, Russia, on Sept. 13, 2025.

A series of events are held on this weekend to celebrate the Moscow City Day and mark the city's 878th founding anniversary. (Photo by Alexander Zemlianichenko Jr/Xinhua)

People take part in a cycling event during Moscow City Day celebrations in Moscow, Russia, on Sept. 13, 2025.

A series of events are held on this weekend to celebrate the Moscow City Day and mark the city's 878th founding anniversary. (Photo by Alexander Zemlianichenko Jr/Xinhua)

People participate in commemorative events marking the Moscow City Day at Gorky Park in Moscow, Russia, on Sept. 13, 2025.

A series of events are held on this weekend to celebrate the Moscow City Day and mark the city's 878th founding anniversary. (Xinhua/Hao Jianwei)

People take part in a cycling event during Moscow City Day celebrations in Moscow, Russia, on Sept. 13, 2025.

A series of events are held on this weekend to celebrate the Moscow City Day and mark the city's 878th founding anniversary. (Photo by Alexander Zemlianichenko Jr/Xinhua)