Final-year student Alina Repkina prepares for a livestream of the Last Bell ceremony for school leavers at secondary school No 11 in Rostov-On-Don, Russia on May 30, 2020. It is the first time in Russia that such ceremonies have been held via video link due to the coronavirus lockdown restrictions. (Photo by Valery Matytsin/TASS)

A military helicopter flies over people during the Afghan Security Forces Exhibition, at the Darul Aman Palace in Kabul, Afghanistan, Wednesday, March 3, 2021. The three-day military exhibition in Kabul allowed civilians to have a first hand view and take pictures of weaponry used by Afghan Security forces. (Photo by Rahmat Gul/AP Photo)

The reflection of a man dressed as Hindu deity of death Yamaraj (R) to raise awareness about the coronavirus is seen on the wing mirror of a vintage car during a government-imposed nationwide lockdown as a preventive measure against the COVID-19 coronavirus, in Kolkata on April 24, 2020. (Photo by Dibyangshu Sarkar/AFP Photo)

A police officer holds a pistol during clashes with protesters near a burning tyre barricade in the Kariobangi slum of Nairobi, Kenya Friday, May 8, 2020. Hundreds of protesters blocked one of the capital's major highways with burning tires to protest government demolitions of the homes of more than 7,000 people and the closure of a major food market, causing many to sleep out in the rain and cold because of restrictions on movement due to the coronavirus. (Photo by Brian Inganga/AP Photo)

This photo taken on May 20, 2020 shows elementary school students wearing wings to maintain social distancing amid concerns of the COVID-19 coronavirus, in a classroom in Taiyuan in China's northern Shanxi province. (Photo by AFP Photo/China Stringer Network)

In Paris, doctors, orderlies and nurses demonstrated as well as all over France to remind the government of its promises on the hospital, in the middle of the “Segur de la sante” on June 16, 2020. The demonstration brought together several thousand people, with a few clashes on the esplanade des Invalides at the end of the day. (Photo by Jan Schmidt-Whitley/Le Pictorium Agency via ZUMA/Rex Features/Shutterstock)

Five-year-old sniffing dog “Vine” wears protection goggles against the sun and dust as he poses together with Giulia Gausemann for photographers, at the sniffing dogs school of the German Army (Bundeswehr) in Daun, Germany, July 24, 2020. The Bundeswehr sniffing dogs school and the veterinarian university of Hanover are developing a training programme to sniff out the coronavirus disease (COVID-19) with dogs at airports, border crossings and other highly frequented places. (Photo by Wolfgang Rattay/Reuters)

A woman on her hen day reacts as members of the public enjoy a drink in the Grassmarket as lockdown measures are eased on April 26, 2021 in Edinburgh, United Kingdom. Cafes, beer gardens, non-essential shops and museums are reopening in Scotland today as lockdown easing continues. (Photo by Jeff J. Mitchell/Getty Images)