A woman instructs a boy on how to pose for pictures in front of a mural depicting Soviet pilot Valery Chkalov – who took a non-stop flight over the Arctic and landed in the US state of Washington in 1937 – at Chkalovskaya metro station in Moscow on August 14, 2019. (Photo by Yuri Kadobnov/AFP Photo)

Fire fighters, emergency service vehicles and a helicopter in Moskovsky Prospekt at the entrance to Tekhnologichesky Institut station of the St Petersburg metro in the aftermath of an explosion which occurred in a train at 14:40 Moscow timeon April 3, 2017. (Photo by Peter Kovalev/TASS)

This image released by Metro Goldwyn Mayer Pictures shows Ana de Armas in a scene from “No Time To Die”. (Photo by Nicola Dove/Metro Goldwyn Mayer Pictures via AP Photo)

A woman sells vegetables near a Metro train station in downtown Lima, Peru December 1, 2015. (Photo by Mariana Bazo/Reuters)

A woman dressed up for Halloween travels on a Metro train in São Paulo, Brazil on October 30, 2017. (Photo by Cris Faga/Rex Features/Shutterstock)

Budgies feed on seeds from a local visitor's hands at Ocean Park in metro Manila, Philippines September 10, 2016. (Photo by Romeo Ranoco/Reuters)

Demonstrators argue in front of the Louisville Metro Hall on September 5, 2020 in Louisville, Kentucky. Ahead of the Kentucky Derby, demonstrators clashed over recent looting and destruction in the area and the death of Breonna Taylor, who was fatally shot by Louisville Metro police officers during a no-knock raid at her apartment on March 13, 2020. (Photo by Brandon Bell/Getty Images)

Boys play with a drainage culvert used for flood control in Las Pinas, Metro Manila February 28, 2016. (Photo by Erik De Castro/Reuters)