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MOSCOW, RUSSIA - MARCH 3, 2021: A man is seen outside a mobile vaccination site at the Rio shopping center where people can receive the Gam-COVID-Vac (Sputnik V) COVID-19 vaccine. The walk-in vaccination site offers free COVID-19 vaccines. Alexander Shcherbak/TASS (Photo by Alexander Shcherbak\TASS via Getty Images)

MOSCOW, RUSSIA - MARCH 3, 2021: A man is seen outside a mobile vaccination site at the Rio shopping center where people can receive the Gam-COVID-Vac (Sputnik V) COVID-19 vaccine. The walk-in vaccination site offers free COVID-19 vaccines. Alexander Shcherbak/TASS (Photo by Alexander Shcherbak\TASS via Getty Images)